Implement TryGetFeature on secondary previewer windows #17409
Merged
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What does the pull request do?
A corner case, but still a regression.
With previewer, we have two different IWindowImpl implementations: PreviewerWindowImpl and WindowStub.
Where first one is actually used to render previewer contents, and second is only used for secondary windows opened on side, not rendered anywhere.
In one of my previous Screen PRs I moved IScreenImpl initialization to the TryGetFeature method, but haven't noticed this second WindowStub implementation. Which regressed in #17401.
Note for future: consider removing all these stubs, and instead basing previewer protocol on top of Avalonia.Headless.
Fixed issues
Fixes #17401