- bug fix, apply modifier removed modifier even on certain

errors
 - change drawimagespace to check and update object data if
   it needs a recalc. this fixes errors with a recalc being
   flushed but not actually being done before spaceimage
   redraws. Updates typically actually happen in draw loop,
   which is not a great design...
 - make shared vertexcol didn't flush update

source/blender/src/buttons_editing.c

@@ -762,10 +762,12 @@ static void modifiers_applyModifier(void *obv, void *mdv)
 		return;
 	}
 
-	BLI_remlink(&ob->modifiers, md);
-	modifier_free(md);
+	if (converted) {
+		BLI_remlink(&ob->modifiers, md);
+		modifier_free(md);
 
-	BIF_undo_push("Apply modifier");
+		BIF_undo_push("Apply modifier");
+	}
 }
 
 static void modifiers_copyModifier(void *ob_v, void *md_v)