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Support for materialDesign:ScrollViewerAssist.BubbleVerticalScroll in various controls #4055

@corvinsz

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@corvinsz

Bug explanation

the attached property materialDesign:ScrollViewerAssist.BubbleVerticalScroll is not supported for the following types:

  • DataGrid
  • ListBox
  • ListView
  • TreeView
  • materialDesign:TreeListView

Support for these controls would be especially useful in nested scrolling scenarios, such as a DataGrid hosted inside a ScrollViewer.

At the moment, when the mouse cursor is hovering over the inner control, vertical scrolling of the parent ScrollViewer is blocked - even if the inner control itself is not scrollable (for example because it only contains a few items and its own ScrollViewer is not active/visible). This results in a degraded UX, as users are unable to continue scrolling the surrounding content unless they move the cursor outside the control first.

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5.3.2

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