in src/dotnet/JetBrains.PresentationAssistant/WpfPopupWindow.cs [67:73]
protected override void DetachWindowEvents()
{
window.SizeChanged -= OnWindowSizeChanged;
window.Closed -= OnWindowClosed;
window.Deactivated -= OnWindowDeactivated;
window.SourceInitialized -= OnWindowSourceInitialized;
}