Revert "Collection Editor based on patch by Julian Eisel"

This reverts commit 3da834e83ce9d7056c033148dab04885a6d3b1b7.

We will use the outliner for this now.

I'm also moving the collections_ops.c to outliner_collections.c

32 files changed, 65 insertions, 470 deletions

diff --git a/source/blender/blenkernel/BKE_context.h b/source/blender/blenkernel/BKE_context.h
index 23f9ff28f8b..606b045dff8 100644
--- a/source/blender/blenkernel/BKE_context.h
+++ b/source/blender/blenkernel/BKE_context.h
@@ -170,7 +170,6 @@ struct SpaceAction *CTX_wm_space_action(const bContext *C);
 struct SpaceInfo *CTX_wm_space_info(const bContext *C);
 struct SpaceUserPref *CTX_wm_space_userpref(const bContext *C);
 struct SpaceClip *CTX_wm_space_clip(const bContext *C);
-struct SpaceCollections *CTX_wm_space_collections(const bContext *C);
 
 void CTX_wm_manager_set(bContext *C, struct wmWindowManager *wm);
 void CTX_wm_window_set(bContext *C, struct wmWindow *win);
diff --git a/source/blender/blenkernel/intern/context.c b/source/blender/blenkernel/intern/context.c
index a7c53dda8c7..39c595dfdba 100644
--- a/source/blender/blenkernel/intern/context.c
+++ b/source/blender/blenkernel/intern/context.c
@@ -815,14 +815,6 @@ struct SpaceClip *CTX_wm_space_clip(const bContext *C)
 	return NULL;
 }
 
-struct SpaceCollections *CTX_wm_space_collections(const bContext *C)
-{
-	ScrArea *sa = CTX_wm_area(C);
-	if (sa && sa->spacetype == SPACE_COLLECTIONS)
-		return sa->spacedata.first;
-	return NULL;
-}
-
 void CTX_wm_manager_set(bContext *C, wmWindowManager *wm)
 {
 	C->wm.manager = wm;
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 19023b26bdf..3413f30b9d8 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -103,8 +103,6 @@
 #include "DNA_movieclip_types.h"
 #include "DNA_mask_types.h"
 
-#include "RNA_access.h"
-
 #include "MEM_guardedalloc.h"
 
 #include "BLI_endian_switch.h"
@@ -6580,10 +6578,6 @@ static void lib_link_screen(FileData *fd, Main *main)
 						
 						slogic->gpd = newlibadr_us(fd, sc->id.lib, slogic->gpd);
 					}
-					else if (sl->spacetype == SPACE_COLLECTIONS) {
-						SpaceCollections *slayer = (SpaceCollections *)sl;
-						slayer->flag |= SC_COLLECTION_DATA_REFRESH;
-					}
 				}
 			}
 			sc->id.tag &= ~LIB_TAG_NEED_LINK;
@@ -6969,10 +6963,6 @@ void blo_lib_link_screen_restore(Main *newmain, bScreen *curscreen, Scene *cursc
 					
 					slogic->gpd = restore_pointer_by_name(id_map, (ID *)slogic->gpd, USER_REAL);
 				}
-				else if (sl->spacetype == SPACE_COLLECTIONS) {
-					SpaceCollections *slayer = (SpaceCollections *)sl;
-					slayer->flag |= SC_COLLECTION_DATA_REFRESH;
-				}
 			}
 		}
 	}
@@ -7367,10 +7357,6 @@ static bool direct_link_screen(FileData *fd, bScreen *sc)
 				sclip->scopes.track_preview = NULL;
 				sclip->scopes.ok = 0;
 			}
-			else if (sl->spacetype == SPACE_COLLECTIONS) {
-				SpaceCollections *slayer = (SpaceCollections *)sl;
-				slayer->flag |= SC_COLLECTION_DATA_REFRESH;
-			}
 		}
 		
 		BLI_listbase_clear(&sa->actionzones);
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index f781fbcdb18..ef46026f058 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -3136,9 +3136,6 @@ static void write_screens(WriteData *wd, ListBase *scrbase)
 				else if (sl->spacetype == SPACE_INFO) {
 					writestruct(wd, DATA, SpaceInfo, 1, sl);
 				}
-				else if (sl->spacetype == SPACE_COLLECTIONS) {
-					writestruct(wd, DATA, SpaceCollections, 1, sl);
-				}
 			}
 		}
 	}
diff --git a/source/blender/editors/CMakeLists.txt b/source/blender/editors/CMakeLists.txt
index 7e804a5bbfc..1559512d713 100644
--- a/source/blender/editors/CMakeLists.txt
+++ b/source/blender/editors/CMakeLists.txt
@@ -47,7 +47,6 @@ if(WITH_BLENDER)
 	add_subdirectory(space_graph)
 	add_subdirectory(space_image)
 	add_subdirectory(space_info)
-	add_subdirectory(space_collections)
 	add_subdirectory(space_logic)
 	add_subdirectory(space_nla)
 	add_subdirectory(space_node)
diff --git a/source/blender/editors/include/BIF_glutil.h b/source/blender/editors/include/BIF_glutil.h
index 0355925f837..35e9f35b4ef 100644
--- a/source/blender/editors/include/BIF_glutil.h
+++ b/source/blender/editors/include/BIF_glutil.h
@@ -49,7 +49,6 @@ struct ColorManagedDisplaySettings;
 
 void fdrawline(float x1, float y1, float x2, float y2); /* DEPRECATED */
 void fdrawbox(float x1, float y1, float x2, float y2); /* DEPRECATED */
-void fdrawbox_filled(float x1, float y1, float x2, float y2);
 void sdrawline(int x1, int y1, int x2, int y2); /* DEPRECATED */
 void sdrawbox(int x1, int y1, int x2, int y2); /* DEPRECATED */
 
diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 4d79a42e64e..f621ee7989d 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -55,7 +55,6 @@ struct wmOperatorType;
 struct PointerRNA;
 struct PropertyRNA;
 struct EnumPropertyItem;
-struct LayerTree;
 
 /* object_edit.c */
 struct Object *ED_object_context(struct bContext *C);               /* context.object */
diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index 01be63919be..f5f66a07aea 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -162,7 +162,6 @@ int     ED_operator_image_active(struct bContext *C);
 int     ED_operator_nla_active(struct bContext *C);
 int     ED_operator_logic_active(struct bContext *C);
 int     ED_operator_info_active(struct bContext *C);
-int     ED_operator_collections_active(struct bContext *C);
 int     ED_operator_console_active(struct bContext *C);
 
 
diff --git a/source/blender/editors/include/ED_space_api.h b/source/blender/editors/include/ED_space_api.h
index b754e1ba20f..d268c578cf2 100644
--- a/source/blender/editors/include/ED_space_api.h
+++ b/source/blender/editors/include/ED_space_api.h
@@ -58,7 +58,6 @@ void ED_spacetype_logic(void);
 void ED_spacetype_console(void);
 void ED_spacetype_userpref(void);
 void ED_spacetype_clip(void);
-void ED_spacetype_collections(void);
 
 /* calls for instancing and freeing spacetype static data 
  * called in WM_init_exit */
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 8b783377f61..69d15859407 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -212,9 +212,6 @@ enum {
 	UI_BUT_ALIGN_STITCH_TOP  = (1 << 18),
 	UI_BUT_ALIGN_STITCH_LEFT = (1 << 19),
 	UI_BUT_ALIGN_ALL         = (UI_BUT_ALIGN | UI_BUT_ALIGN_STITCH_TOP | UI_BUT_ALIGN_STITCH_LEFT),
-
-	/* Another hack, in some rare cases we don't want any text margin */
-	UI_BUT_TEXT_NO_MARGIN    = (1 << 20),
 };
 
 /* scale fixed button widths by this to account for DPI */
diff --git a/source/blender/editors/include/UI_interface_icons.h b/source/blender/editors/include/UI_interface_icons.h
index f08c46af8a6..945ac1b6db9 100644
--- a/source/blender/editors/include/UI_interface_icons.h
+++ b/source/blender/editors/include/UI_interface_icons.h
@@ -83,6 +83,5 @@ struct PreviewImage *UI_icon_to_preview(int icon_id);
 
 int UI_rnaptr_icon_get(struct bContext *C, struct PointerRNA *ptr, int rnaicon, const bool big);
 int UI_idcode_icon_get(const int idcode);
-int UI_colorset_icon_get(const int set_idx);
 
 #endif /*  __UI_INTERFACE_ICONS_H__ */
diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index a9cdb34f634..f61eb99a621 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -1407,14 +1407,6 @@ int UI_idcode_icon_get(const int idcode)
 	}
 }
 
-/**
- * \param set_idx: A value from #rna_enum_color_sets_items.
- */
-int UI_colorset_icon_get(const int set_idx)
-{
-	return (set_idx < 1) ? ICON_NONE : VICO_COLORSET_01_VEC - 1 + set_idx;
-}
-
 static void icon_draw_at_size(
         float x, float y, int icon_id, float aspect, float alpha,
         enum eIconSizes size, const bool nocreate)
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index 08d1b69dd22..e3bad758dd7 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -1582,10 +1582,7 @@ static void widget_draw_text_icon(uiFontStyle *fstyle, uiWidgetColors *wcol, uiB
 		}
 	}
 
-	if (but->drawflag & UI_BUT_TEXT_NO_MARGIN) {
-		/* skip */
-	}
-	else if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
+	if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
 		rect->xmin += (UI_TEXT_MARGIN_X * U.widget_unit) / but->block->aspect;
 	}
 	else if ((but->drawflag & UI_BUT_TEXT_RIGHT)) {
diff --git a/source/blender/editors/interface/resources.c b/source/blender/editors/interface/resources.c
index fbfbdb13a5f..a6235a8d26d 100644
--- a/source/blender/editors/interface/resources.c
+++ b/source/blender/editors/interface/resources.c
@@ -167,9 +167,6 @@ const unsigned char *UI_ThemeGetColorPtr(bTheme *btheme, int spacetype, int colo
 				case SPACE_CLIP:
 					ts = &btheme->tclip;
 					break;
-				case SPACE_COLLECTIONS:
-					ts = &btheme->tcollections;
-					break;
 				default:
 					ts = &btheme->tv3d;
 					break;
@@ -1211,11 +1208,6 @@ void ui_theme_init_default(void)
 	rgba_char_args_set(btheme->tclip.strip_select, 0xff, 0x8c, 0x00, 0xff);
 	btheme->tclip.handle_vertex_size = 5;
 	ui_theme_space_init_handles_color(&btheme->tclip);
-
-	/* space collection manager */
-	btheme->tcollections = btheme->tv3d;
-	rgba_char_args_set_fl(btheme->tcollections.back,    0.42, 0.42, 0.42, 1.0);
-	rgba_char_args_set(btheme->tcollections.hilite, 255, 140, 25, 255);  /* selected files */
 }
 
 void ui_style_init_default(void)
@@ -2879,11 +2871,7 @@ void init_userdef_do_versions(void)
 	 * (keep this block even if it becomes empty).
 	 */
 	{
-		for (bTheme *btheme = U.themes.first; btheme; btheme = btheme->next) {
-			btheme->tcollections = btheme->tv3d;
-			rgba_char_args_set_fl(btheme->tcollections.back,    0.42, 0.42, 0.42, 1.0);
-			rgba_char_args_set(btheme->tcollections.hilite, 255, 140, 25, 255);  /* selected files */
-		}
+		
 	}
 
 	if (U.pixelsize == 0.0f)
diff --git a/source/blender/editors/screen/glutil.c b/source/blender/editors/screen/glutil.c
index 4a8edef4ca2..4baf3cd78b7 100644
--- a/source/blender/editors/screen/glutil.c
+++ b/source/blender/editors/screen/glutil.c
@@ -75,18 +75,6 @@ void fdrawbox(float x1, float y1, float x2, float y2)
 	glEnd();
 }
 
-void fdrawbox_filled(float x1, float y1, float x2, float y2)
-{
-	glBegin(GL_POLYGON);
-
-	glVertex2f(x1, y1);
-	glVertex2f(x1, y2);
-	glVertex2f(x2, y2);
-	glVertex2f(x2, y1);
-
-	glEnd();
-}
-
 void fdrawcheckerboard(float x1, float y1, float x2, float y2) /* DEPRECATED */
 {
 	unsigned char col1[4] = {40, 40, 40}, col2[4] = {50, 50, 50};
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index a55d6c2143f..32b63aca34c 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -321,10 +321,6 @@ int ED_operator_info_active(bContext *C)
 	return ed_spacetype_test(C, SPACE_INFO);
 }
 
-int ED_operator_collections_active(bContext *C)
-{
-	return ed_spacetype_test(C, SPACE_COLLECTIONS);
-}
 
 int ED_operator_console_active(bContext *C)
 {
diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index 8c278c0b3ae..5ff1d758563 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -96,7 +96,6 @@ void ED_spacetypes_init(void)
 	ED_spacetype_console();
 	ED_spacetype_userpref();
 	ED_spacetype_clip();
-	ED_spacetype_collections();
 //	...
 	
 	/* register operator types for screen and all spaces */
diff --git a/source/blender/editors/space_collections/CMakeLists.txt b/source/blender/editors/space_collections/CMakeLists.txt
deleted file mode 100644
index 1cc4a40d657..00000000000
--- a/source/blender/editors/space_collections/CMakeLists.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-# ***** BEGIN GPL LICENSE BLOCK *****
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software Foundation,
-# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# Contributor(s): Jacques Beaurain.
-#
-# ***** END GPL LICENSE BLOCK *****
-
-set(INC
-	../include
-	../../blenkernel
-	../../blenlib
-	../../blentranslation
-	../../gpu
-	../../makesdna
-	../../makesrna
-	../../windowmanager
-	../../../../intern/guardedalloc
-	../../../../intern/glew-mx
-)
-
-set(INC_SYS
-	${GLEW_INCLUDE_PATH}
-)
-
-set(SRC
-	collections_ops.c
-	space_collections.c
-
-	collections_intern.h
-)
-
-blender_add_lib(bf_editor_space_collections "${SRC}" "${INC}" "${INC_SYS}")
diff --git a/source/blender/editors/space_collections/collections_intern.h b/source/blender/editors/space_collections/collections_intern.h
deleted file mode 100644
index 866f59659c3..00000000000
--- a/source/blender/editors/space_collections/collections_intern.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * ***** BEGIN GPL LICENSE BLOCK *****
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * ***** END GPL LICENSE BLOCK *****
- */
-
-/** \file blender/editors/space_collections/collections_intern.h
- *  \ingroup spcollections
- */
-
-#ifndef __COLLECTIONS_INTERN_H__
-#define __COLLECTIONS_INTERN_H__
-
-struct wmKeyConfig;
-
-/* collections_ops.c */
-void collections_operatortypes(void);
-void collections_keymap(struct wmKeyConfig *keyconf);
-
-#endif  /* __COLLECTIONS_INTERN_H__ */
-
diff --git a/source/blender/editors/space_collections/space_collections.c b/source/blender/editors/space_collections/space_collections.c
deleted file mode 100644
index 7dd50e5cbac..00000000000
--- a/source/blender/editors/space_collections/space_collections.c
+++ /dev/null
@@ -1,182 +0,0 @@
-/*
- * ***** BEGIN GPL LICENSE BLOCK *****
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * ***** END GPL LICENSE BLOCK *****
- */
-
-/** \file blender/editors/space_collections/space_collections.c
- *  \ingroup spcollections
- */
-
-#include <string.h>
-
-#include "MEM_guardedalloc.h"
-
-#include "BIF_gl.h"
-
-#include "BKE_context.h"
-#include "BKE_screen.h"
-
-#include "BLI_ghash.h"
-#include "BLI_listbase.h"
-
-#include "ED_screen.h"
-#include "ED_space_api.h"
-
-#include "UI_resources.h"
-#include "UI_view2d.h"
-
-#include "WM_api.h"
-#include "WM_types.h"
-
-#include "collections_intern.h" /* own include */
-
-/* ******************** default callbacks for collection manager space ***************** */
-
-static SpaceLink *collections_new(const bContext *UNUSED(C))
-{
-	ARegion *ar;
-	SpaceCollections *scollection; /* hmm, that's actually a good band name... */
-
-	scollection = MEM_callocN(sizeof(SpaceCollections), __func__);
-	scollection->spacetype = SPACE_COLLECTIONS;
-
-	/* header */
-	ar = MEM_callocN(sizeof(ARegion), "header for collection manager");
-	BLI_addtail(&scollection->regionbase, ar);
-	ar->regiontype = RGN_TYPE_HEADER;
-	ar->alignment = RGN_ALIGN_BOTTOM;
-
-	/* main region */
-	ar = MEM_callocN(sizeof(ARegion), "main region for collection manager");
-	BLI_addtail(&scollection->regionbase, ar);
-	ar->regiontype = RGN_TYPE_WINDOW;
-	ar->v2d.scroll = (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM | V2D_SCROLL_HORIZONTAL_HIDE | V2D_SCROLL_VERTICAL_HIDE);
-	ar->v2d.align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
-
-	return (SpaceLink *)scollection;
-}
-
-static void collections_free(SpaceLink *UNUSED(sl))
-{
-}
-
-static SpaceLink *collections_duplicate(SpaceLink *sl)
-{
-	SpaceCollections *scollection = MEM_dupallocN(sl);
-
-	/* clear or remove stuff from old */
-
-	return (SpaceLink *)scollection;
-}
-
-/* add handlers, stuff you only do once or on area/region changes */
-static void collection_main_region_init(wmWindowManager *wm, ARegion *ar)
-{
-	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
-	ar->v2d.scroll |= (V2D_SCROLL_VERTICAL_FULLR | V2D_SCROLL_HORIZONTAL_FULLR);
-
-	/* own keymap */
-	wmKeyMap *keymap = WM_keymap_find(wm->defaultconf, "Layer Manager", SPACE_COLLECTIONS, 0);
-	WM_event_add_keymap_handler_bb(&ar->handlers, keymap, &ar->v2d.mask, &ar->winrct);
-}
-
-static void collections_main_region_draw(const bContext *C, ARegion *ar)
-{
-	SpaceCollections *spc = CTX_wm_space_collections(C);
-	View2D *v2d = &ar->v2d;
-
-	if (spc->flag & SC_COLLECTION_DATA_REFRESH) {
-	}
-
-	/* v2d has initialized flag, so this call will only set the mask correct */
-	UI_view2d_region_reinit(v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
-
-	UI_ThemeClearColor(TH_BACK);
-	glClear(GL_COLOR_BUFFER_BIT);
-
-	/* reset view matrix */
-	UI_view2d_view_restore(C);
-
-	/* scrollers */
-	View2DScrollers *scrollers;
-	scrollers = UI_view2d_scrollers_calc(C, v2d, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY);
-	UI_view2d_scrollers_draw(C, v2d, scrollers);
-	UI_view2d_scrollers_free(scrollers);
-}
-
-/* add handlers, stuff you only do once or on area/region changes */
-static void collections_header_region_init(wmWindowManager *UNUSED(wm), ARegion *ar)
-{
-	ED_region_header_init(ar);
-}
-
-static void collections_header_region_draw(const bContext *C, ARegion *ar)
-{
-	ED_region_header(C, ar);
-}
-
-static void collections_main_region_listener(bScreen *UNUSED(sc), ScrArea *UNUSED(sa), ARegion *ar, wmNotifier *wmn)
-{
-	switch (wmn->category) {
-		case NC_SCENE:
-			if (wmn->data == ND_LAYER) {
-				ED_region_tag_redraw(ar);
-			}
-			break;
-		case NC_SPACE:
-			if (wmn->data == ND_SPACE_COLLECTIONS) {
-				ED_region_tag_redraw(ar);
-			}
-	}
-}
-
-/* only called once, from space/spacetypes.c */
-void ED_spacetype_collections(void)
-{
-	SpaceType *st = MEM_callocN(sizeof(SpaceType), "spacetype collections");
-	ARegionType *art;
-
-	st->spaceid = SPACE_COLLECTIONS;
-	strncpy(st->name, "LayerManager", BKE_ST_MAXNAME);
-
-	st->new = collections_new;
-	st->free = collections_free;
-	st->duplicate = collections_duplicate;
-	st->operatortypes = collections_operatortypes;
-	st->keymap = collections_keymap;
-
-	/* regions: main window */
-	art = MEM_callocN(sizeof(ARegionType), "spacetype collections region");
-	art->regionid = RGN_TYPE_WINDOW;
-	art->init = collection_main_region_init;
-	art->draw = collections_main_region_draw;
-	art->listener = collections_main_region_listener;
-	art->keymapflag = ED_KEYMAP_UI | ED_KEYMAP_VIEW2D;
-	BLI_addhead(&st->regiontypes, art);
-
-	/* regions: header */
-	art = MEM_callocN(sizeof(ARegionType), "spacetype collections header");
-	art->regionid = RGN_TYPE_HEADER;
-	art->prefsizey = HEADERY;
-	art->keymapflag = ED_KEYMAP_UI | ED_KEYMAP_VIEW2D | ED_KEYMAP_HEADER;
-	art->init = collections_header_region_init;
-	art->draw = collections_header_region_draw;
-	BLI_addhead(&st->regiontypes, art);
-
-	BKE_spacetype_register(st);
-}
diff --git a/source/blender/editors/space_outliner/CMakeLists.txt b/source/blender/editors/space_outliner/CMakeLists.txt
index 289d6e715e1..18998b5de5c 100644
--- a/source/blender/editors/space_outliner/CMakeLists.txt
+++ b/source/blender/editors/space_outliner/CMakeLists.txt
@@ -37,6 +37,7 @@ set(INC_SYS
 )
 
 set(SRC
+	outliner_collections.c
 	outliner_draw.c
 	outliner_edit.c
 	outliner_ops.c
diff --git a/source/blender/editors/space_collections/collections_ops.c b/source/blender/editors/space_outliner/outliner_collections.c
index 7e1bf8091b0..382276a64b2 100644
--- a/source/blender/editors/space_collections/collections_ops.c
+++ b/source/blender/editors/space_outliner/outliner_collections.c
@@ -15,11 +15,13 @@
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  *
+ * Contributor(s): Blender Foundation, Dalai Felinto
+ *
  * ***** END GPL LICENSE BLOCK *****
  */
 
-/** \file blender/editors/space_collections/collections_ops.c
- *  \ingroup spcollections
+/** \file blender/editors/space_outliner/outliner_collections.c
+ *  \ingroup spoutliner
  */
 
 #include "BKE_context.h"
@@ -34,7 +36,7 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 
-#include "collections_intern.h" /* own include */
+#include "outliner_intern.h" /* own include */
 
 /* -------------------------------------------------------------------- */
 /* polls */
@@ -80,15 +82,15 @@ static int operator_collection_active(bContext *C)
 static int collection_link_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNUSED(event))
 {
 	TODO_LAYER_OPERATORS;
-	BKE_report(op->reports, RPT_ERROR, "COLLECTIONS_OT_collection_link not implemented yet");
+	BKE_report(op->reports, RPT_ERROR, "OUTLINER_OT_collections_link not implemented yet");
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_collection_link(wmOperatorType *ot)
+void OUTLINER_OT_collections_link(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Add Collection";
-	ot->idname = "COLLECTIONS_OT_collection_link";
+	ot->idname = "OUTLINER_OT_collections_link";
 	ot->description = "Link a new collection to the active layer";
 
 	/* api callbacks */
@@ -101,15 +103,15 @@ static void COLLECTIONS_OT_collection_link(wmOperatorType *ot)
 static int collection_unlink_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNUSED(event))
 {
 	TODO_LAYER_OPERATORS;
-	BKE_report(op->reports, RPT_ERROR, "COLLECTIONS_OT_collection_unlink not implemented yet");
+	BKE_report(op->reports, RPT_ERROR, "OUTLINER_OT_collections_unlink not implemented yet");
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_collection_unlink(wmOperatorType *ot)
+void OUTLINER_OT_collections_unlink(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Add Collection";
-	ot->idname = "COLLECTIONS_OT_collection_unlink";
+	ot->idname = "OUTLINER_OT_collections_unlink";
 	ot->description = "Link a new collection to the active layer";
 
 	/* api callbacks */
@@ -132,11 +134,11 @@ static int collection_new_exec(bContext *C, wmOperator *UNUSED(op))
 	return OPERATOR_FINISHED;
 }
 
-static void COLLECTIONS_OT_collection_new(wmOperatorType *ot)
+void OUTLINER_OT_collections_new(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "New Collection";
-	ot->idname = "COLLECTIONS_OT_collection_new";
+	ot->idname = "OUTLINER_OT_collections_new";
 	ot->description = "Add a new collection to the scene, and link it to the active layer";
 
 	/* api callbacks */
@@ -150,15 +152,15 @@ static int override_new_invoke(bContext *UNUSED(C), wmOperator *op, const wmEven
 {
 	TODO_LAYER_OPERATORS;
 	TODO_LAYER_OVERRIDE;
-	BKE_report(op->reports, RPT_ERROR, "COLLECTIONS_OT_override_new not implemented yet");
+	BKE_report(op->reports, RPT_ERROR, "OUTLINER_OT_collections_override_new not implemented yet");
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_override_new(wmOperatorType *ot)
+void OUTLINER_OT_collections_override_new(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "New Override";
-	ot->idname = "COLLECTIONS_OT_override_new";
+	ot->idname = "OUTLINER_OT_collections_override_new";
 	ot->description = "Add a new override to the active collection";
 
 	/* api callbacks */
@@ -172,15 +174,15 @@ static void COLLECTIONS_OT_override_new(wmOperatorType *ot)
 static int delete_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNUSED(event))
 {
 	TODO_LAYER_OPERATORS;
-	BKE_report(op->reports, RPT_ERROR, "COLLECTIONS_OT_delete not implemented yet");
+	BKE_report(op->reports, RPT_ERROR, "OUTLINER_OT_collections_delete not implemented yet");
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_delete(wmOperatorType *ot)
+void OUTLINER_OT_collections_delete(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Delete";
-	ot->idname = "COLLECTIONS_OT_delete";
+	ot->idname = "OUTLINER_OT_collections_delete";
 	ot->description = "Delete active  override or collection";
 
 	/* api callbacks */
@@ -200,11 +202,11 @@ static int select_exec(bContext *C, wmOperator *op)
 	return OPERATOR_FINISHED;
 }
 
-static void COLLECTIONS_OT_select(wmOperatorType *ot)
+void OUTLINER_OT_collections_select(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Select";
-	ot->idname = "COLLECTIONS_OT_select";
+	ot->idname = "OUTLINER_OT_collections_select";
 	ot->description = "Change active collection or override";
 
 	/* api callbacks */
@@ -224,11 +226,11 @@ static int rename_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNU
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_rename(wmOperatorType *ot)
+void OUTLINER_OT_collections_rename(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Rename";
-	ot->idname = "COLLECTIONS_OT_rename";
+	ot->idname = "OUTLINER_OT_collections_rename";
 	ot->description = "Rename active collection or override";
 
 	/* api callbacks */
@@ -240,7 +242,6 @@ static void COLLECTIONS_OT_rename(wmOperatorType *ot)
 }
 
 /* -------------------------------------------------------------------- */
-/* property editor operators */
 
 static int stubs_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNUSED(event))
 {
@@ -249,11 +250,11 @@ static int stubs_invoke(bContext *UNUSED(C), wmOperator *op, const wmEvent *UNUS
 	return OPERATOR_CANCELLED;
 }
 
-static void COLLECTIONS_OT_objects_add(wmOperatorType *ot)
+void OUTLINER_OT_collections_objects_add(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Add Objects";
-	ot->idname = "COLLECTIONS_OT_objects_add";
+	ot->idname = "OUTLINER_OT_collections_objects_add";
 	ot->description = "Add selected objects to collection";
 
 	/* api callbacks */
@@ -263,11 +264,11 @@ static void COLLECTIONS_OT_objects_add(wmOperatorType *ot)
 	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-static void COLLECTIONS_OT_objects_remove(wmOperatorType *ot)
+void OUTLINER_OT_collections_objects_remove(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Remove Object";
-	ot->idname = "COLLECTIONS_OT_objects_remove";
+	ot->idname = "OUTLINER_OT_collections_objects_remove";
 	ot->description = "Remove object from collection";
 
 	/* api callbacks */
@@ -277,11 +278,11 @@ static void COLLECTIONS_OT_objects_remove(wmOperatorType *ot)
 	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-static void COLLECTIONS_OT_objects_select(wmOperatorType *ot)
+void OUTLINER_OT_collections_objects_select(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Select Objects";
-	ot->idname = "COLLECTIONS_OT_objects_select";
+	ot->idname = "OUTLINER_OT_collections_objects_select";
 	ot->description = "Selected collection objects";
 
 	/* api callbacks */
@@ -291,11 +292,11 @@ static void COLLECTIONS_OT_objects_select(wmOperatorType *ot)
 	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-static void COLLECTIONS_OT_objects_deselect(wmOperatorType *ot)
+void OUTLINER_OT_collections_objects_deselect(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name = "Deselect Objects";
-	ot->idname = "COLLECTIONS_OT_objects_deselect";
+	ot->idname = "OUTLINER_OT_collections_objects_deselect";
 	ot->description = "Deselected collection objects";
 
 	/* api callbacks */
@@ -305,36 +306,3 @@ static void COLLECTIONS_OT_objects_deselect(wmOperatorType *ot)
 	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-/* ************************** registration - operator types **********************************/
-
-void collections_operatortypes(void)
-{
-	WM_operatortype_append(COLLECTIONS_OT_delete);
-	WM_operatortype_append(COLLECTIONS_OT_select);
-	WM_operatortype_append(COLLECTIONS_OT_rename);
-	WM_operatortype_append(COLLECTIONS_OT_collection_link);
-	WM_operatortype_append(COLLECTIONS_OT_collection_unlink);
-	WM_operatortype_append(COLLECTIONS_OT_collection_new);
-	WM_operatortype_append(COLLECTIONS_OT_override_new);
-
-	WM_operatortype_append(COLLECTIONS_OT_objects_add);
-	WM_operatortype_append(COLLECTIONS_OT_objects_remove);
-	WM_operatortype_append(COLLECTIONS_OT_objects_select);
-	WM_operatortype_append(COLLECTIONS_OT_objects_deselect);
-}
-
-void collections_keymap(wmKeyConfig *keyconf)
-{
-	wmKeyMap *keymap = WM_keymap_find(keyconf, "Collections Manager", SPACE_COLLECTIONS, 0);
-
-	/* selection */
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_select", LEFTMOUSE, KM_CLICK, 0, 0);
-
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_rename", LEFTMOUSE, KM_DBL_CLICK, 0, 0);
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_rename", LEFTMOUSE, KM_PRESS, KM_CTRL, 0);
-
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_collection_new", NKEY, KM_PRESS, KM_CTRL, 0);
-
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_delete", XKEY, KM_PRESS, 0, 0);
-	WM_keymap_add_item(keymap, "COLLECTIONS_OT_delete", DELKEY, KM_PRESS, 0, 0);
-}
diff --git a/source/blender/editors/space_outliner/outliner_intern.h b/source/blender/editors/space_outliner/outliner_intern.h
index 768fe4d8551..aa3bcaaabe6 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -274,4 +274,19 @@ void OUTLINER_OT_modifier_operation(struct wmOperatorType *ot);
 void outliner_operatortypes(void);
 void outliner_keymap(struct wmKeyConfig *keyconf);
 
+/* outliner_collections.c */
+
+void OUTLINER_OT_collections_delete(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_select(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_rename(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_link(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_unlink(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_new(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_override_new(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_objects_add(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_objects_remove(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_objects_select(struct wmOperatorType *ot);
+void OUTLINER_OT_collections_objects_deselect(struct wmOperatorType *ot);
+
+
 #endif /* __OUTLINER_INTERN_H__ */
diff --git a/source/blender/editors/space_outliner/outliner_ops.c b/source/blender/editors/space_outliner/outliner_ops.c
index 5ddfdddc80d..d5adfeda980 100644
--- a/source/blender/editors/space_outliner/outliner_ops.c
+++ b/source/blender/editors/space_outliner/outliner_ops.c
@@ -84,6 +84,19 @@ void outliner_operatortypes(void)
 	WM_operatortype_append(OUTLINER_OT_scene_drop);
 	WM_operatortype_append(OUTLINER_OT_material_drop);
 	WM_operatortype_append(OUTLINER_OT_group_link);
+
+	/* collections */
+	WM_operatortype_append(OUTLINER_OT_collections_delete);
+	WM_operatortype_append(OUTLINER_OT_collections_select);
+	WM_operatortype_append(OUTLINER_OT_collections_rename);
+	WM_operatortype_append(OUTLINER_OT_collections_link);
+	WM_operatortype_append(OUTLINER_OT_collections_unlink);
+	WM_operatortype_append(OUTLINER_OT_collections_new);
+	WM_operatortype_append(OUTLINER_OT_collections_override_new);
+	WM_operatortype_append(OUTLINER_OT_collections_objects_add);
+	WM_operatortype_append(OUTLINER_OT_collections_objects_remove);
+	WM_operatortype_append(OUTLINER_OT_collections_objects_select);
+	WM_operatortype_append(OUTLINER_OT_collections_objects_deselect);
 }
 
 void outliner_keymap(wmKeyConfig *keyconf)
diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 3524c041069..350b9675e9e 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -1345,20 +1345,6 @@ typedef enum eSpaceClip_GPencil_Source {
 	SC_GPENCIL_SRC_TRACK = 1,
 } eSpaceClip_GPencil_Source;
 
-/* Collection Manager ======================================= */
-
-typedef struct SpaceCollections {
-	SpaceLink *next, *prev;
-	ListBase regionbase;        /* storage of regions for inactive spaces */
-	int spacetype;
-	int flag; /* eSpaceCollections_Flag */
-} SpaceCollections;
-
-/* SpaceClip->flag */
-typedef enum eSpaceCollections_Flag {
-	SC_COLLECTION_DATA_REFRESH = (1 << 0), /* recreate/update SpaceCollections layer data, needed for undo/read/write */
-} eSpaceCollections_Flag;
-
 /* **************** SPACE DEFINES ********************* */
 
 /* space types, moved from DNA_screen_types.h */
@@ -1388,9 +1374,8 @@ typedef enum eSpace_Type {
 	SPACE_CONSOLE  = 18,
 	SPACE_USERPREF = 19,
 	SPACE_CLIP     = 20,
-	SPACE_COLLECTIONS   = 21,
-
-	SPACEICONMAX = SPACE_COLLECTIONS
+	
+	SPACEICONMAX = SPACE_CLIP
 } eSpace_Type;
 
 /* use for function args */
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index 6cc24f74cee..1dc6c7ab578 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -390,8 +390,7 @@ typedef struct bTheme {
 	ThemeSpace tuserpref;
 	ThemeSpace tconsole;
 	ThemeSpace tclip;
-	ThemeSpace tcollections;
-
+	
 	/* 20 sets of bone colors for this theme */
 	ThemeWireColor tarm[20];
 	/*ThemeWireColor tobj[20];*/
diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index 2221526fa8b..e1f3320483b 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -581,7 +581,6 @@ extern StructRNA RNA_SpaceFileBrowser;
 extern StructRNA RNA_SpaceGraphEditor;
 extern StructRNA RNA_SpaceImageEditor;
 extern StructRNA RNA_SpaceInfo;
-extern StructRNA RNA_SpaceCollectionManager;
 extern StructRNA RNA_SpaceLogicEditor;
 extern StructRNA RNA_SpaceNLA;
 extern StructRNA RNA_SpaceNodeEditor;
@@ -650,7 +649,6 @@ extern StructRNA RNA_ThemeFontStyle;
 extern StructRNA RNA_ThemeGraphEditor;
 extern StructRNA RNA_ThemeImageEditor;
 extern StructRNA RNA_ThemeInfo;
-extern StructRNA RNA_ThemeCollectionManager;
 extern StructRNA RNA_ThemeLogicEditor;
 extern StructRNA RNA_ThemeNLAEditor;
 extern StructRNA RNA_ThemeNodeEditor;
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index c6fc2a6b4c0..07a1a73358d 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -79,7 +79,6 @@ EnumPropertyItem rna_enum_space_type_items[] = {
 	{0, "", ICON_NONE, NULL, NULL},
 	{SPACE_BUTS, "PROPERTIES", ICON_BUTS, "Properties", "Edit properties of active object and related data-blocks"},
 	{SPACE_OUTLINER, "OUTLINER", ICON_OOPS, "Outliner", "Overview of scene graph and all available data-blocks"},
-	{SPACE_COLLECTIONS, "COLLECTION_MANAGER", ICON_COLLAPSEMENU, "Collections", "Edit collections of active render layer"},
 	{SPACE_USERPREF, "USER_PREFERENCES", ICON_PREFERENCES, "User Preferences", "Edit persistent configuration settings"},
 	{SPACE_INFO, "INFO", ICON_INFO, "Info", "Main menu bar and list of error messages (drag down to expand and display)"},
 	{0, "", ICON_NONE, NULL, NULL},
@@ -317,8 +316,6 @@ static StructRNA *rna_Space_refine(struct PointerRNA *ptr)
 			return &RNA_SpaceUserPreferences;
 		case SPACE_CLIP:
 			return &RNA_SpaceClipEditor;
-		case SPACE_COLLECTIONS:
-			return &RNA_SpaceCollectionManager;
 		default:
 			return &RNA_Space;
 	}
@@ -4821,15 +4818,6 @@ static void rna_def_space_clip(BlenderRNA *brna)
 	RNA_def_property_update(prop, NC_SPACE | ND_SPACE_CLIP, NULL);
 }
 
-static void rna_def_space_collections(BlenderRNA *brna)
-{
-	StructRNA *srna;
-
-	srna = RNA_def_struct(brna, "SpaceCollectionManager", "Space");
-	RNA_def_struct_sdna(srna, "SpaceCollections");
-	RNA_def_struct_ui_text(srna, "Space Collection Manager", "Layer Collection space data");
-}
-
 
 void RNA_def_space(BlenderRNA *brna)
 {
@@ -4856,7 +4844,6 @@ void RNA_def_space(BlenderRNA *brna)
 	rna_def_space_node(brna);
 	rna_def_space_logic(brna);
 	rna_def_space_clip(brna);
-	rna_def_space_collections(brna);
 }
 
 #endif
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index 29cb76f5029..e68e67586e9 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -2956,26 +2956,6 @@ static void rna_def_userdef_theme_space_clip(BlenderRNA *brna)
 	rna_def_userdef_theme_spaces_curves(srna, false, false, false, true);
 }
 
-static void rna_def_userdef_theme_space_collections(BlenderRNA *brna)
-{
-	StructRNA *srna;
-	PropertyRNA *prop;
-
-	srna = RNA_def_struct(brna, "ThemeCollectionManager", NULL);
-	RNA_def_struct_sdna(srna, "ThemeSpace");
-	RNA_def_struct_clear_flag(srna, STRUCT_UNDO);
-	RNA_def_struct_ui_text(srna, "Theme Collection Manager", "Theme settings for the Collection Manager");
-
-	rna_def_userdef_theme_spaces_main(srna);
-	rna_def_userdef_theme_spaces_list_main(srna);
-
-	prop = RNA_def_property(srna, "selected_collection", PROP_FLOAT, PROP_COLOR_GAMMA);
-	RNA_def_property_float_sdna(prop, NULL, "hilite");
-	RNA_def_property_array(prop, 3);
-	RNA_def_property_ui_text(prop, "Selected Collection", "");
-	RNA_def_property_update(prop, 0, "rna_userdef_update");
-}
-
 static void rna_def_userdef_themes(BlenderRNA *brna)
 {
 	StructRNA *srna;
@@ -3002,7 +2982,6 @@ static void rna_def_userdef_themes(BlenderRNA *brna)
 		{16, "FILE_BROWSER", ICON_FILESEL, "File Browser", ""},
 		{17, "CONSOLE", ICON_CONSOLE, "Python Console", ""},
 		{20, "CLIP_EDITOR", ICON_CLIP, "Movie Clip Editor", ""},
-		{21, "COLLECTION_MANAGER", ICON_COLLAPSEMENU, "Collection Manager", ""},
 		{0, NULL, 0, NULL, NULL}
 	};
 
@@ -3136,12 +3115,6 @@ static void rna_def_userdef_themes(BlenderRNA *brna)
 	RNA_def_property_pointer_sdna(prop, NULL, "tclip");
 	RNA_def_property_struct_type(prop, "ThemeClipEditor");
 	RNA_def_property_ui_text(prop, "Clip Editor", "");
-
-	prop = RNA_def_property(srna, "collection_manager", PROP_POINTER, PROP_NONE);
-	RNA_def_property_flag(prop, PROP_NEVER_NULL);
-	RNA_def_property_pointer_sdna(prop, NULL, "tcollections");
-	RNA_def_property_struct_type(prop, "ThemeCollectionManager");
-	RNA_def_property_ui_text(prop, "Collection Manager", "");
 }
 
 static void rna_def_userdef_addon(BlenderRNA *brna)
@@ -3232,7 +3205,6 @@ static void rna_def_userdef_dothemes(BlenderRNA *brna)
 	rna_def_userdef_theme_space_console(brna);
 	rna_def_userdef_theme_space_logic(brna);
 	rna_def_userdef_theme_space_clip(brna);
-	rna_def_userdef_theme_space_collections(brna);
 	rna_def_userdef_theme_colorset(brna);
 	rna_def_userdef_themes(brna);
 }
diff --git a/source/blender/python/intern/bpy_rna_callback.c b/source/blender/python/intern/bpy_rna_callback.c
index b8c9b3ff9e9..df1c4155a6d 100644
--- a/source/blender/python/intern/bpy_rna_callback.c
+++ b/source/blender/python/intern/bpy_rna_callback.c
@@ -174,7 +174,6 @@ static eSpace_Type rna_Space_refine_reverse(StructRNA *srna)
 	if (srna == &RNA_SpaceConsole)          return SPACE_CONSOLE;
 	if (srna == &RNA_SpaceUserPreferences)  return SPACE_USERPREF;
 	if (srna == &RNA_SpaceClipEditor)       return SPACE_CLIP;
-	if (srna == &RNA_SpaceCollectionManager)     return SPACE_COLLECTIONS;
 	return SPACE_EMPTY;
 }
 
diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index 49e70b4f200..3bed4dac2cf 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -364,7 +364,6 @@ typedef struct wmNotifier {
 #define ND_SPACE_CHANGED		(18<<16) /*sent to a new editor type after it's replaced an old one*/
 #define ND_SPACE_CLIP			(19<<16)
 #define ND_SPACE_FILE_PREVIEW   (20<<16)
-#define ND_SPACE_COLLECTIONS         (21<<16)
 
 /* subtype, 256 entries too */
 #define NOTE_SUBTYPE		0x0000FF00
diff --git a/source/blender/windowmanager/intern/wm_keymap.c b/source/blender/windowmanager/intern/wm_keymap.c
index 4179ac7f993..e201fa433d4 100644
--- a/source/blender/windowmanager/intern/wm_keymap.c
+++ b/source/blender/windowmanager/intern/wm_keymap.c
@@ -1861,10 +1861,6 @@ wmKeyMap *WM_keymap_guess_opname(const bContext *C, const char *opname)
 	else if (STRPREFIX(opname, "OUTLINER_OT")) {
 		km = WM_keymap_find_all(C, "Outliner", sl->spacetype, 0);
 	}
-	/* Layer Manager */
-	else if (STRPREFIX(opname, "COLLECTIONS_OT")) {
-		km = WM_keymap_find_all(C, "Collection Manager", sl->spacetype, 0);
-	}
 	/* Transform */
 	else if (STRPREFIX(opname, "TRANSFORM_OT")) {
 		/* check for relevant editor */