_background_supports_alpha
should be added to WinForm ProgressBar
#2430
Labels
bug
A crash or error in behavior.
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windows
The issue relates to Microsoft Windows support.
Describe the bug
As title explain, ProgressBar widget on Windows doesn't support alpha color and raise an exception when set to transparent. To avoid this, the widget class should declare
_background_supports_alpha = False
Steps to reproduce
Simply create a Progress bar with TRANSPARENT background.
Expected behavior
Should not raise an exception.
Screenshots
No response
Environment
Logs
Additional context
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