vastly improved rubberband selection behavior with selection manager widgets

app/widget/keyframeview/keyframeview.cpp

@@ -254,6 +254,15 @@ bool KeyframeView::Paste(std::function<Node *(const QString &)> find_node_functi
   return false;
 }
 
+void KeyframeView::CatchUpScrollEvent()
+{
+  super::CatchUpScrollEvent();
+
+  if (this->selection_manager_.IsRubberBanding()) {
+    this->selection_manager_.RubberBandMove(this->viewport()->mapFromGlobal(QCursor::pos()));
+  }
+}
+
 void KeyframeView::mousePressEvent(QMouseEvent *event)
 {
   NodeKeyframe *key_under_cursor = selection_manager_.GetObjectAtPoint(event->pos());
@@ -289,7 +298,7 @@ void KeyframeView::mouseMoveEvent(QMouseEvent *event)
     KeyframeDragMove(event, tip);
     selection_manager_.DragMove(event, tip);
   } else if (selection_manager_.IsRubberBanding()) {
-    selection_manager_.RubberBandMove(event);
+    selection_manager_.RubberBandMove(event->pos());
     Redraw();
   }
 
@@ -618,6 +627,13 @@ void KeyframeView::ShowKeyframePropertiesDialog()
   }
 }
 
+void KeyframeView::UpdateRubberBandForScroll()
+{
+  if (this->selection_manager_.IsRubberBanding()) {
+    this->selection_manager_.RubberBandMove(this->viewport()->mapFromGlobal(QCursor::pos()));
+  }
+}
+
 void KeyframeView::Redraw()
 {
   viewport()->update();