Steps to reproduce:
- Have DockSite.UseDragFloatPreviews="True" on a touch screen enabled device
- Tap and hold on a docking tab or window header until Windows 10 touch gesture rectangle appears
- Try moving finger as if you're undocking a window/tab
- Semitransparent blue rectangle appears and blocks interaction until the app is reopened
Reproducible on Simple IDE demo from Sample Browser (need to check menu item at "Options" > "Use Drag Float Previews").
Below is a screen recording uploaded on Google Drive which shows how to reproduce the bug.