Mouse clicks/hover swallowed while debugger.break() if GTK popup is showing

I'm using JetBrains Rider 2019.3.1 on Xubuntu 19.10 to develop a Gtk3 app using the GtkSharp wrapper v3.22.25.56 from NuGet.

When debugging in Rider, if I break whilst a GtkEntryCompletion popup is visible, all mouse clicks are swallowed on the whole XFCE desktop.

The mouse pointer moves as normal, but no clicks are registered anywhere in the OS, and no hover functionality works (tooltips etc.)

Luckily the keyboard still works, so I can Alt-Tab to Rider and then F5 to continue (then the mouse buttons come back to life).

Here is a test app that shows the issue:, along with a typical idea.log.


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Thank you for reporting the issue. I have created a corresponding issue on our bug tracker: RIDER-38714. I would also appreciate if you could provide us a screencast of the issue to make sure we fully understand you and also attach the full log bundle. Thank you in advance!


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