Finish changes in up/down arrows for menus

Restored single triangle for special menus, which still isn't perfect but
probably makes more sense.

Added drawflag bit flags to button, which is currently used to declare, that
button need to have up/down arrows. This is needed because it's tricky to
distinguish if button should have such arrows. For example, ID search buttons
is a simple block button which doesn't directly mean it'll have pop-up menu
and not all buttons which cases pop-up menu to display need to have such
arrows.

So currently only ID selector button is forcing up/down arrows to be displayed,
all the rest buttons now behaves in the same way as it used to be before.

9 files changed, 29 insertions, 10 deletions

diff --git a/release/scripts/startup/bl_ui/properties_data_armature.py b/release/scripts/startup/bl_ui/properties_data_armature.py
index 1b7a8f4a66e..6bec652045e 100644
--- a/release/scripts/startup/bl_ui/properties_data_armature.py
+++ b/release/scripts/startup/bl_ui/properties_data_armature.py
@@ -130,7 +130,7 @@ class DATA_PT_bone_groups(ArmatureButtonsPanel, Panel):
         col.active = (ob.proxy is None)
         col.operator("pose.group_add", icon='ZOOMIN', text="")
         col.operator("pose.group_remove", icon='ZOOMOUT', text="")
-        col.menu("DATA_PT_bone_group_specials", icon='BLANK1', text="")
+        col.menu("DATA_PT_bone_group_specials", icon='DOWNARROW_HLT', text="")
         if group:
             col.separator()
             col.operator("pose.group_move", icon='TRIA_UP', text="").direction = 'UP'
diff --git a/release/scripts/startup/bl_ui/properties_data_mesh.py b/release/scripts/startup/bl_ui/properties_data_mesh.py
index e23db7c59a1..7ca464ce055 100644
--- a/release/scripts/startup/bl_ui/properties_data_mesh.py
+++ b/release/scripts/startup/bl_ui/properties_data_mesh.py
@@ -149,7 +149,7 @@ class DATA_PT_vertex_groups(MeshButtonsPanel, Panel):
         col = row.column(align=True)
         col.operator("object.vertex_group_add", icon='ZOOMIN', text="")
         col.operator("object.vertex_group_remove", icon='ZOOMOUT', text="")
-        col.menu("MESH_MT_vertex_group_specials", icon='BLANK1', text="")
+        col.menu("MESH_MT_vertex_group_specials", icon='DOWNARROW_HLT', text="")
         if group:
             col.operator("object.vertex_group_move", icon='TRIA_UP', text="").direction = 'UP'
             col.operator("object.vertex_group_move", icon='TRIA_DOWN', text="").direction = 'DOWN'
@@ -208,7 +208,7 @@ class DATA_PT_shape_keys(MeshButtonsPanel, Panel):
         sub = col.column(align=True)
         sub.operator("object.shape_key_add", icon='ZOOMIN', text="").from_mix = False
         sub.operator("object.shape_key_remove", icon='ZOOMOUT', text="")
-        sub.menu("MESH_MT_shape_key_specials", icon='BLANK1', text="")
+        sub.menu("MESH_MT_shape_key_specials", icon='DOWNARROW_HLT', text="")
 
         if kb:
             col.separator()
diff --git a/release/scripts/startup/bl_ui/properties_material.py b/release/scripts/startup/bl_ui/properties_material.py
index d2fe40fe9dc..6e66bd0d98b 100644
--- a/release/scripts/startup/bl_ui/properties_material.py
+++ b/release/scripts/startup/bl_ui/properties_material.py
@@ -110,7 +110,7 @@ class MATERIAL_PT_context_material(MaterialButtonsPanel, Panel):
             col.operator("object.material_slot_add", icon='ZOOMIN', text="")
             col.operator("object.material_slot_remove", icon='ZOOMOUT', text="")
 
-            col.menu("MATERIAL_MT_specials", icon='BLANK1', text="")
+            col.menu("MATERIAL_MT_specials", icon='DOWNARROW_HLT', text="")
 
             if ob.mode == 'EDIT':
                 row = layout.row(align=True)
diff --git a/release/scripts/startup/bl_ui/properties_texture.py b/release/scripts/startup/bl_ui/properties_texture.py
index 976684ea742..1d5e96cf701 100644
--- a/release/scripts/startup/bl_ui/properties_texture.py
+++ b/release/scripts/startup/bl_ui/properties_texture.py
@@ -130,7 +130,7 @@ class TEXTURE_PT_context_texture(TextureButtonsPanel, Panel):
             col = row.column(align=True)
             col.operator("texture.slot_move", text="", icon='TRIA_UP').type = 'UP'
             col.operator("texture.slot_move", text="", icon='TRIA_DOWN').type = 'DOWN'
-            col.menu("TEXTURE_MT_specials", icon='BLANK1', text="")
+            col.menu("TEXTURE_MT_specials", icon='DOWNARROW_HLT', text="")
 
         split = layout.split(percentage=0.65)
         col = split.column()
@@ -511,7 +511,7 @@ class TEXTURE_PT_envmap(TextureTypePanel, Panel):
 
         row = layout.row()
         row.prop(env, "source", expand=True)
-        row.menu("TEXTURE_MT_envmap_specials", icon='BLANK1', text="")
+        row.menu("TEXTURE_MT_envmap_specials", icon='DOWNARROW_HLT', text="")
 
         if env.source == 'IMAGE_FILE':
             layout.template_ID(tex, "image", open="image.open")
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index c0f9d6dd5cd..b82a0c5e480 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -171,6 +171,9 @@ typedef struct uiLayout uiLayout;
 #define UI_PANEL_WIDTH          340
 #define UI_COMPACT_PANEL_WIDTH  160
 
+/* uiBut->drawflag */
+#define UI_BUT_DRAW_ENUM_ARROWS    (1 << 0) /* draw enum-like up/down arrows for button */
+
 /* scale fixed button widths by this to account for DPI
  * 8.4852 == sqrtf(72.0f)) */
 #define UI_DPI_FAC (sqrtf((float)U.dpi) / 8.48528137423857f)
@@ -427,6 +430,9 @@ int     UI_but_active_drop_name(struct bContext *C);
 void    uiButSetFlag(uiBut *but, int flag);
 void    uiButClearFlag(uiBut *but, int flag);
 
+void    uiButSetDrawFlag(uiBut *but, int flag);
+void    uiButClearDrawFlag(uiBut *but, int flag);
+
 /* special button case, only draw it when used actively, for outliner etc */
 int     uiButActiveOnly(const struct bContext *C, uiBlock *block, uiBut *but);
 
diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index 0c13b5de02e..c0cd17d16d2 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -3356,6 +3356,16 @@ void uiButClearFlag(uiBut *but, int flag)
 	but->flag &= ~flag;
 }
 
+void uiButSetDrawFlag(uiBut *but, int flag)
+{
+	but->drawflag |= flag;
+}
+
+void uiButClearDrawFlag(uiBut *but, int flag)
+{
+	but->drawflag &= ~flag;
+}
+
 int uiButGetRetVal(uiBut *but)
 {
 	return but->retval;
diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index 2c4ec9ac482..5d12bdf71da 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -150,7 +150,7 @@ typedef struct {
 
 struct uiBut {
 	struct uiBut *next, *prev;
-	int flag;
+	int flag, drawflag;
 	short type, pointype, bit, bitnr, retval, strwidth, ofs, pos, selsta, selend, alignnr;
 	short pad1;
 
diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index 6b0ffb1b54e..6d1766c8bf1 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -376,6 +376,9 @@ static void template_ID(bContext *C, uiLayout *layout, TemplateID *template, Str
 	else if (flag & UI_ID_BROWSE) {
 		but = uiDefBlockButN(block, id_search_menu, MEM_dupallocN(template), "", 0, 0, UI_UNIT_X * 1.6, UI_UNIT_Y,
 		                     TIP_(template_id_browse_tip(type)));
+
+		uiButSetDrawFlag(but, UI_BUT_DRAW_ENUM_ARROWS);
+
 		if (type) {
 			but->icon = RNA_struct_ui_icon(type);
 			/* default dragging of icon for id browse buttons */
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index 2edc2b22e7e..4d483b69ca2 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -3136,10 +3136,10 @@ void ui_draw_but(const bContext *C, ARegion *ar, uiStyle *style, uiBut *but, rct
 
 				/* no text, with icon */
 				else if (!but->str[0] && but->icon) {
-					if (but->flag & UI_ICON_PREVIEW)
-						wt = widget_type(UI_WTYPE_MENU_ICON_RADIO); /* no arrows */
-					else
+					if (but->drawflag & UI_BUT_DRAW_ENUM_ARROWS)
 						wt = widget_type(UI_WTYPE_MENU_RADIO);  /* with arrows */
+					else
+						wt = widget_type(UI_WTYPE_MENU_ICON_RADIO); /* no arrows */
 				}
 				/* with menu arrows */
 				else