Fixed CI failure : Restore BackButtonBehavior IsEnabled after CanExecute changes#34668
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kubaflo merged 1 commit intodotnet:inflight/candidatefrom Mar 26, 2026
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Hey there @@Shalini-Ashokan! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed. |
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Issue details
This PR #28734 causes the unit test below
Description of Change
The root cause is IsEnabledCore { set => SetValue(IsEnabledProperty, value && IsEnabled); } — a circular read: once IsEnabledProperty is false, reading IsEnabled always returns false, so the property is permanently stuck.
The fix introduces two backing fields to track the concerns independently:
_userDefinedIsEnabled — written only by the developer via IsEnabled
_commandEnabled — written only by CanExecute via IsEnabledCore
IsEnabledProperty is always _userDefinedIsEnabled && _commandEnabled, eliminating the circular read.
BackButtonDisabledWhenCommandDisabled — When CanExecute flips to true and ChangeCanExecute() is called, _commandEnabled updates correctly and the back button re-enables.
BackButtonUpdatesWhenSetToNewCommand — Setting Command = null resets _commandEnabled = true, so the back button re-enables as expected.
Test fixed
Unit tests:
BackButtonUpdatesWhenSetToNewCommand
BackButtonDisabledWhenCommandDisabled