Problem scrolling Dialog content in UWP - Windows 10 - DPI 125%, 150% and 175%

[edsonmata]

Describe the bug

The dialog content is cut off when performing the described reproduction steps. Bug:

• You must have DPI 125%, 150% and 175% and Windows 10
• You must enable the vertical scrollviewer of the dialog content.
• Remove the Title and/or Buttons from the dialog, the problem is more evident.
• Add a quantity of text that shows the scrollviewer
• If the last line has letters like g, j - the end may be cut off when scrolling with the mouse.

Investigating, we realized that Microsoft's own Content dialog ends up making the wrong calculation when enabling the vertical scrollviewer. This problem occurs specifically in UWP, Windows 10. Through investigation, it was discovered that when using fixed values

The component behaves properly, but this approach is problematic because it does not know the fixed size of the content. The correct way is to use it the way Microsoft itself uses it:

Steps to reproduce the bug

Bug:

• Must have DPI 125%, 150% and 175% and Windows 10
• Must enable the vertical scrollviewer of the Dialog content.
• Remove the Title and/or Buttons from the dialog, the problem is more evident.
• Add a quantity of text that shows the scrollviewer
• If the last line has letters like g, j - the end may be cut off when scrolling with the mouse.

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 2 - Microsoft.UI.Xaml 2.8.2

Windows version

Windows 10 (21H2): Build 19044

Additional context

No response

[whiskhub]

offtopic, but congrats for creating the 10'000th issue on the WinUI GitHub repo 😅

[marcelwgn]

I am unable to reproduce this issue (though I am on Windows 11). Can you tell me where you found that OneUIContentDialogStyle? My app crashes since it's unable to locate that style.