Remove unused flag ExpandCelCanvas::UseModifiedRegionAsUndoInfo

src/app/ui/editor/tool_loop_impl.cpp

@@ -525,12 +525,6 @@ public:
       m_tx,
       ExpandCelCanvas::Flags(
         ExpandCelCanvas::NeedsSource |
-        // If the tool is freehand-like, we can use the modified
-        // region directly as undo information to save the modified
-        // pixels. See ExpandCelCanvas::commit() for details about this flag.
-        (getController()->isFreehand() ?
-         ExpandCelCanvas::UseModifiedRegionAsUndoInfo:
-         ExpandCelCanvas::None) |
         (m_layer->isTilemap() &&
          (!m_tilesMode || m_ink->isSelection()) ?
          ExpandCelCanvas::PixelsBounds:

src/app/util/expand_cel_canvas.h

@@ -46,10 +46,9 @@ namespace app {
     enum Flags {
       None = 0,
       NeedsSource = 1,
-      UseModifiedRegionAsUndoInfo = 2,
       // Use tiles mode but with pixels bounds in dst image (e.g. for
       // selection preview)
-      PixelsBounds = 4,
+      PixelsBounds = 2,
     };
 
     ExpandCelCanvas(Site site, Layer* layer,