First svn commit of the experiment with layers. Preemptive backup (to shorten delay before drawing) is currently disabled. Basic Undo/Redo works, but not image resizing, the adjust tool, and saving (not even flattened)

git-svn-id: svn://pulkomandy.tk/GrafX2/branches/layers@1039 416bcca6-2ee7-4201-b75f-2eb2f807beb1

operatio.c

@@ -3004,7 +3004,8 @@ void Brush_0_5(void)
     Brush_offset_X=(Brush_offset_X/Snap_width)*Snap_width;
     Brush_offset_Y=(Brush_offset_Y/Snap_height)*Snap_height;
   }
-
+  
+  End_of_modification();
   End_of_modification();
   Return_to_draw_mode();
 }