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Opened by Luca Bacci@lb90
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Destroying a parented ComboBox triggers a Gtk-CRITICAL ** warning

Steps to reproduce

  1. Create a CombBox
  2. Add it to a widget hierarchy
  3. Call show_all() on the toplevel
  4. Destroy the ComboBox

I have attached a small and self-contained example that exhibits the issue.

Current behavior

Destroying the combobox triggers the warning:

Gtk-CRITICAL **: 15:46:41.789: gtk_widget_is_drawable: assertion 'GTK_IS_WIDGET (widget)' failed

Expected outcome

We should get no error message

Version information

Gtk 3.22.30 on Arch Linux

gtk_combo_example.c