[Evolution] New critical GTK warning `_gtk_widget_captured_event: assertion 'WIDGET_REALIZED_FOR_EVENT (widget, event)' failed`

[Paul Menzel <paulepanter users sourceforge net>]

Dear Evolution folks,


I believe since GTK+ was updated in Debian Sid/unstable to 3.22.6-1,
with Evolution and Evolution Data Server 3.22.3, I see a lot of the
warnings below written to the terminal, and Evolution is unresponsive.
After killing Evolution, and starting it again, it seems to work.

```
(evolution:4643): Gtk-CRITICAL **: _gtk_widget_captured_event: assertion 'WIDGET_REALIZED_FOR_EVENT (widget, 
event)' failed
```

Does anybody else see this?


Thanks,

Paul

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