From 9a49a26eb38ba856664c6215ea62fd77464e72ce Mon Sep 17 00:00:00 2001
From: Dalai Felinto <dfelinto@gmail.com>
Date: Fri, 22 Mar 2019 12:45:42 -0300
Subject: Fix T62348: Cycles - Viewport rendering not update on switching
 viewlayer

It updates only the main window you edit and the non-main window
children of this main one.

Reviewers: sergey, brecht

Differential Revision: https://developer.blender.org/D4528
---
 source/blender/editors/include/ED_render.h      |  2 ++
 source/blender/editors/render/render_update.c   |  7 +++++++
 source/blender/windowmanager/intern/wm_window.c | 16 +++++++++-------
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/source/blender/editors/include/ED_render.h b/source/blender/editors/include/ED_render.h
index d0deefbe7b0..fd6818d6717 100644
--- a/source/blender/editors/include/ED_render.h
+++ b/source/blender/editors/include/ED_render.h
@@ -34,6 +34,7 @@ struct Render;
 struct Scene;
 struct ScrArea;
 struct bContext;
+struct bScreen;
 struct wmWindowManager;
 
 /* render_ops.c */
@@ -44,6 +45,7 @@ void ED_operatortypes_render(void);
 
 void ED_render_engine_changed(struct Main *bmain);
 void ED_render_engine_area_exit(struct Main *bmain, struct ScrArea *sa);
+void ED_render_view_layer_changed(struct Main *bmain, struct bScreen *sc);
 
 /* Callbacks handling data update events coming from depsgraph. */
 
diff --git a/source/blender/editors/render/render_update.c b/source/blender/editors/render/render_update.c
index d99c9847ed6..bbd73b581f4 100644
--- a/source/blender/editors/render/render_update.c
+++ b/source/blender/editors/render/render_update.c
@@ -199,6 +199,13 @@ void ED_render_engine_changed(Main *bmain)
 	}
 }
 
+void ED_render_view_layer_changed(Main *bmain, bScreen *sc)
+{
+	for (ScrArea *sa = sc->areabase.first; sa; sa = sa->next) {
+		ED_render_engine_area_exit(bmain, sa);
+	}
+}
+
 /***************************** Updates ***********************************
  * ED_render_id_flush_update gets called from DEG_id_tag_update, to do   *
  * editor level updates when the ID changes. when these ID blocks are in *
diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index 89b7e53a93a..3181ee0f937 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -65,6 +65,7 @@
 #include "wm_event_system.h"
 
 #include "ED_anim_api.h"
+#include "ED_render.h"
 #include "ED_scene.h"
 #include "ED_screen.h"
 #include "ED_fileselect.h"
@@ -2210,16 +2211,17 @@ ViewLayer *WM_window_get_active_view_layer(const wmWindow *win)
 void WM_window_set_active_view_layer(wmWindow *win, ViewLayer *view_layer)
 {
 	BLI_assert(BKE_view_layer_find(WM_window_get_active_scene(win), view_layer->name) != NULL);
+	Main *bmain = G_MAIN;
 
-	wmWindowManager *wm = G_MAIN->wm.first;
+	wmWindowManager *wm = bmain->wm.first;
 	wmWindow *win_parent = (win->parent) ? win->parent : win;
 
-	/* Set  view layer in parent and child windows. */
-	STRNCPY(win_parent->view_layer_name, view_layer->name);
-
-	for (wmWindow *win_child = wm->windows.first; win_child; win_child = win_child->next) {
-		if (win_child->parent == win_parent) {
-			STRNCPY(win_child->view_layer_name, view_layer->name);
+	/* Set view layer in parent and child windows. */
+	for (wmWindow *win_iter = wm->windows.first; win_iter; win_iter = win_iter->next) {
+		if ((win_iter == win_parent) || (win_iter->parent == win_parent)) {
+			STRNCPY(win_iter->view_layer_name, view_layer->name);
+			bScreen *screen = BKE_workspace_active_screen_get(win_iter->workspace_hook);
+			ED_render_view_layer_changed(bmain, screen);
 		}
 	}
 }
-- 
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