[Bf-blender-cvs] [520fb5c] master: Fix T45041: (2.75RC) blender crashes when I choose 'Refresh DataBlock Previews'.

[Bastien Montagne]

Commit: 520fb5c8cd3d57e6c2b5676aae73008a1a038300
Author: Bastien Montagne
Date:   Fri Jun 12 09:55:04 2015 +0200
Branches: master
https://developer.blender.org/rB520fb5c8cd3d57e6c2b5676aae73008a1a038300

Fix T45041: (2.75RC) blender crashes when I choose 'Refresh DataBlock Previews'.

Not sure where this sneaked in, but we for sure need a valid context (otherwise
we'd need to pass a Main alog too).

This is to be backported to final 2.75.

===================================================================

M	source/blender/windowmanager/intern/wm_operators.c

===================================================================

diff --git a/source/blender/windowmanager/intern/wm_operators.c b/source/blender/windowmanager/intern/wm_operators.c
index cd97293..c39d0fc 100644
--- a/source/blender/windowmanager/intern/wm_operators.c
+++ b/source/blender/windowmanager/intern/wm_operators.c
@@ -4777,6 +4777,7 @@ static void WM_OT_dependency_relations(wmOperatorType *ot)
 /* *************************** Mat/tex/etc. previews generation ************* */
 
 typedef struct PreviewsIDEnsureStack {
+	bContext *C;
 	Scene *scene;
 
 	BLI_LINKSTACK_DECLARE(id_stack, ID *);
@@ -4801,7 +4802,7 @@ static bool previews_id_ensure_callback(void *todo_v, ID **idptr, int UNUSED(cd_
 
 	if (id && (id->flag & LIB_DOIT)) {
 		if (ELEM(GS(id->name), ID_MA, ID_TE, ID_IM, ID_WO, ID_LA)) {
-			previews_id_ensure(NULL, todo->scene, id);
+			previews_id_ensure(todo->C, todo->scene, id);
 		}
 		id->flag &= ~LIB_DOIT;  /* Tag the ID as done in any case. */
 		BLI_LINKSTACK_PUSH(todo->id_stack, id);
@@ -4826,6 +4827,7 @@ static int previews_ensure_exec(bContext *C, wmOperator *UNUSED(op))
 
 	for (scene = bmain->scene.first; scene; scene = scene->id.next) {
 		preview_id_stack.scene = scene;
+		preview_id_stack.C = C;
 		id = (ID *)scene;
 
 		do {