Public bug reported:
I have recently installed Ubuntu 18.04 on a new computer and have a
Gtk+3.0 program that reports an error:-
Gtk-CRITICAL gtk_widget_is_drawable: assertion 'GTK_IS_WIDGET (widget)'
failed
The same program runs without error on another computer with 16.04.
The problem occurs when a ComboBoxText widget in a container (grid) is
destroyed using gtk_widget_destroy.
Other widgets may be affected but the problem does not occur for GtkScale
widgets. The widget does actually get destroyed, but the message is produced in
the process.
I have also found that using gtk_container_remove avoids the error, but the
docs indicate that this is
inefficient and not preferred.
I have attached a test program to reproduce the error. It also includes
a few other things that I tried to see if they made any difference but
to no avail. 'Destroy cbox' is the essential test to reproduce.
System details:
Description: Ubuntu 18.04.1 LTS
Release: 18.04
libwxgtk3.0-dev:
Installed: (none)
Candidate: 3.0.4+dfsg-3
Version table:
3.0.4+dfsg-3 500
500 http://au.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
** Affects: network-manager-applet (Ubuntu)
Importance: Undecided
Status: New
** Tags: destroy gtk widget
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https://bugs.launchpad.net/bugs/1816032
Title:
gtk_widget_destroy reports error
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