Grease pencil: non-blocking sketch sessions

- Implement own undo stack for grease pencil, so now there'll be no keymaps conflicts.
- Supported redo's during sketch session.
- Get rid of flag stored in Globals -- use undo stack to check if grease pencil session is active.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/util/undo.c b/source/blender/editors/util/undo.c
index a2381a208ef..c1aca61f795 100644
--- a/source/blender/editors/util/undo.c
+++ b/source/blender/editors/util/undo.c
@@ -54,6 +54,7 @@
 #include "ED_armature.h"
 #include "ED_particle.h"
 #include "ED_curve.h"
+#include "ED_gpencil.h"
 #include "ED_mball.h"
 #include "ED_mesh.h"
 #include "ED_object.h"
@@ -126,6 +127,11 @@ static int ed_undo_step(bContext *C, int step, const char *undoname)
 	Object *obact= CTX_data_active_object(C);
 	ScrArea *sa= CTX_wm_area(C);
 
+	/* grease pencil can be can be used in plenty of spaces, so check it first */
+	if(ED_gpencil_session_active()) {
+		return ED_undo_gpencil_step(C, step, undoname);
+	}
+
 	if(sa && sa->spacetype==SPACE_IMAGE) {
 		SpaceImage *sima= (SpaceImage *)sa->spacedata.first;