Restore keyboard activation for selected tree items - #4036
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Allow Enter and Space to be handled by SharpTreeView instead of being intercepted by ListBoxItem selection handling.
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Fixes #4030
Problem
In ILSpy 10.x, Enter and Space activated the selected item in
SharpTreeView.After the Avalonia migration,
ListBoxItemhandles these keys as selection input before they reachSharpTreeView, so the existing activation logic is not invoked.Solution
ShouldTriggerSelectionso Enter and Space can be handled bySharpTreeViewinstead of being intercepted byListBoxItemselection handling.