Fixed tile selection not rendering properly on tilemaps with an offset (

#1636)

Co-authored-by: Semphris <[email protected]>

src/editor/overlay_widget.cpp

@@ -1170,7 +1170,7 @@ EditorOverlayWidget::align_to_tilemap(const Vector& sp, int tile_size) const
     return Vector(0, 0);
   }
 
-  Vector sp_ = sp - tilemap->get_offset();
+  Vector sp_ = sp + tilemap->get_offset() / static_cast<float>(tile_size);
   return (sp_ - (sp_ % 1.f)) * static_cast<float>(tile_size);
 }