Allow nested BindingNotifications. #15722
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When #13970 was written, [a check](https://github.com/AvaloniaUI/Avalonia/pull/13970/files#diff-cfb25a491b9452e1815aa2c0d71465aaf81e99792a88a04a1a2ed572fd1930ffR60) was added to ensure that nested `BindingNotification`s didn't happen, and the refactor was written with the assumption that they wouldn't happen. The problem is that they _do_ happen: when a source object implements both `INotifyDataErrorInfo` and had data annotations, then the nested data validation plugins would each wrap the value coming from the previous plugin in a new `BindingNotification`, resulting in nested `BindingNotifications`. This adds support for nested binding notifications back in - even though IMO nesting binding notifications is a bug, if we're doing it and we previously supported it then we should continue to support it. Fixes #15201
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* Added failing test for #15201. * Handle nested BindingNotifications. When #13970 was written, [a check](https://github.com/AvaloniaUI/Avalonia/pull/13970/files#diff-cfb25a491b9452e1815aa2c0d71465aaf81e99792a88a04a1a2ed572fd1930ffR60) was added to ensure that nested `BindingNotification`s didn't happen, and the refactor was written with the assumption that they wouldn't happen. The problem is that they _do_ happen: when a source object implements both `INotifyDataErrorInfo` and had data annotations, then the nested data validation plugins would each wrap the value coming from the previous plugin in a new `BindingNotification`, resulting in nested `BindingNotifications`. This adds support for nested binding notifications back in - even though IMO nesting binding notifications is a bug, if we're doing it and we previously supported it then we should continue to support it. Fixes #15201
grokys
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What does the pull request do?
When the binding system refactor (#13970) was written, a check was added to ensure that nested
BindingNotifications didn't happen, and the refactor was written with the assumption that they wouldn't happen.The problem is that they do happen: when a source object implements both
INotifyDataErrorInfoand had data annotations, then the nested data validation plugins would each wrap the value coming from the previous plugin in a newBindingNotification, resulting in nestedBindingNotifications.This adds support for nested binding notifications back in - even though IMO nesting binding notifications is a bug, if we're doing it and we previously supported it then we should continue to support it.
Fixed issues
Fixes #15201