Fix T41818: Missing refresh on Undo for nodes (mask example)

Added a special notifier now NC_WM|ND_UNDO in order to deal with such cases
and now compositor/image will refresh when undo happens.

There are much more ways to fail compo to update the resul, like undoing
while it's not visible and so, but as mont29 said -- let's at least fix
obvious crap in the workflow.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/editors/space_node/space_node.c b/source/blender/editors/space_node/space_node.c
index 9eaee60bfce..875639da113 100644
--- a/source/blender/editors/space_node/space_node.c
+++ b/source/blender/editors/space_node/space_node.c
@@ -420,6 +420,9 @@ static void node_area_listener(bScreen *sc, ScrArea *sa, wmNotifier *wmn)
 						}
 					}
 					break;
+				case ND_LAYER_CONTENT:
+					ED_area_tag_refresh(sa);
+					break;
 			}
 			break;
 
@@ -507,6 +510,11 @@ static void node_area_listener(bScreen *sc, ScrArea *sa, wmNotifier *wmn)
 				ED_area_tag_refresh(sa);
 			}
 			break;
+		case NC_WM:
+			if(wmn->data == ND_UNDO) {
+				ED_area_tag_refresh(sa);
+			}
+			break;
 	}
 }