microsoft
AnnotatedScrollBar slides off screen
Which version of the app?
WinUI 3 Gallery
Description
In WinUi3 Gallery's AnnotatedScrollBar demo, when the window is not maximized, dragging the slider outside of the window allows it to continue to move
Screenshots
https://github.com/user-attachments/assets/d065d3d4-176d-4127-9eea-0a72cf4577bc
Windows version
Windows 11 23H2 (22631)
Additional context
No response
### Tasks
This looks like an issue with AnnotatedScrollBar. Transferring issue to microsoft-ui-xaml repo.
It seems to be normal to be able to drag scrollviewer in the same pointer event even when the mouse has left the window boundaries. It seems the issue is with the height of the scrollviewer not adapting to the height of the window, since it's a scrollviewer in scrollviewer scenario in WinUI-Gallery. This is poor design in general cases, but makes sense for the gallery scenario.
The question is if this is an issue with all scrollviewer controls, or if it's by design.
I would say this is expected behaviour personally and present on all scroll controls - i.e, the scrollbar captures the pointer and lets you continue scroll even if not directly touching it, partly to improve usability because of how thin the scrollbar can be.
