This bug was fixed in the package gtk+3.0 - 3.22.30-1ubuntu3
---------------
gtk+3.0 (3.22.30-1ubuntu3) bionic; urgency=medium
[ Sebastien Bacher ]
* d/p/Check-for-NULL-priv-popup_window-in-gtk_combo_box_popdown.patch:
- Check for NULL priv->popup_window in gtk_combo_box_popdown()
(lp: #1816032)
[ Andrea Azzarone ]
* d/p/restore_filechooser_typeaheadfind.patch:
- Disable typeahead if in search mode (LP: #1592177)
-- Sebastien Bacher <seb...@ubuntu.com> Tue, 02 Apr 2019 17:30:09
+0200
** Changed in: gtk+3.0 (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1816032
Title:
gtk_widget_destroy reports error
Status in gtk+3.0 package in Ubuntu:
Fix Released
Status in gtk+3.0 source package in Bionic:
Fix Released
Bug description:
* Impact
Buggy warnings are displayed in some cases, which can confuses users/coders
* Test case
Build and use the small program attached in the comments, it should display
no warning
* Regression potential
The change is a simple null check in the combo widget code, the regression
potential is low but make sure combos work in a few softwares just in case
------------------------------
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
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