Scrollviewer: Setting Borderbrush and Borderthickness has no effect

[FG-rgb]

In the ControlTemplate of the Scrollviewer there are missing TemplateBindings for Borderbrush and Borderthickness. Therefore setting the properties has no effect to the Scrollviewer. Found in AvaloniaUI Version 0.10.0-preview5, using Avalonia.Themes.Default/DefaultTheme.

[timunie]

Where should this be set? I think this is by design. If you need to have a border visible, I guess one has to override the controltemplate with the needed ControlTemplate. Please find the original one here:
https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Themes.Simple/Controls/ScrollViewer.xaml

Note: as this is imo by design, I'll convert this into a Discussion now.

[FG-rgb]

The ControlTemplate of the ScrollViewer.xaml should set Borderbrush and Borderthickness,
as done in other controls:

This would look like:

...
<ScrollContentPresenter Name="PART_ContentPresenter"
                                  Padding="{TemplateBinding Padding}"
BorderThickness={TemplateBinding BorderThickness}
BorderBrush={TemplateBinding BorderBrush}
                                  HorizontalSnapPointsType="{TemplateBinding HorizontalSnapPointsType}"
                                  VerticalSnapPointsType="{TemplateBinding VerticalSnapPointsType}"
                                  HorizontalSnapPointsAlignment="{TemplateBinding HorizontalSnapPointsAlignment}"
                                  VerticalSnapPointsAlignment="{TemplateBinding VerticalSnapPointsAlignment}"
                                  Background="{TemplateBinding Background}"
                                  ScrollViewer.IsScrollInertiaEnabled="{TemplateBinding IsScrollInertiaEnabled}">
...

Just a reminder...

[timunie]

If you think that this should be there out of the box, a PR would be welcome I think.

[nadirvishun]

It's still not working in the latest version 11.3.0

[maxkatz6]

Feel free to open a PR with proposed changes from above