Fix saving images from temp Image Editor failing

Steps to reproduce were:
* Ensure //Render//->//Display Mode// is //New Window//
* F12
* In the opened Image Editor, Alt+S to save the image
* Save the image
The saving would fail silently.

Issue was that wm_handler_op_context() would fail to find the correct
area to activate, as the wrong window was active in context. So allow
overriding this window and do so when creating the file-select handler.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/windowmanager/wm_event_system.h b/source/blender/windowmanager/wm_event_system.h
index 53b25a80dce..c53ccda170a 100644
--- a/source/blender/windowmanager/wm_event_system.h
+++ b/source/blender/windowmanager/wm_event_system.h
@@ -116,6 +116,10 @@ typedef struct wmEventHandler_Op {
 
   /** Store context for this handler for derived/modal handlers. */
   struct {
+    /* To override the window, and hence the screen. Set for few cases only, usually window/screen
+     * can be taken from current context. */
+    struct wmWindow *win;
+
     struct ScrArea *area;
     struct ARegion *region;
     short region_type;