A minimal example program to reproduce the behaviour.
In the example a click on "show subwindow" opens a second window, in which a
component is inserted at showing up. On the first time all is ok like shown in
the left part of the screenshot. But if you close the second (sub) window and
open it again, then the is a wrong size calculation for the window size.
Further testing shows up, that this only happen, when the window is set to not
resizeable. As soon as the window is set to resizeable, all is ok.
** Attachment added: "minimal example program to reproduce the bug"
https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1822768/+attachment/5252035/+files/example.tar
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https://bugs.launchpad.net/bugs/1822768
Title:
libgtk window resize problem
Status in gtk+3.0 package in Ubuntu:
New
Bug description:
An app using libgtk-3 as GUI-lib shows strange behaviour since on ubuntu
18.04 an later.
The problem is, that a not resizeable window not sets its correct size, when
it shows up a second and all further times - but the first time, the size is
correct.
In that window a gtk element is inserted while showing up, so the size have
to be recalculated.
This stange behaviour is only found on Ubuntu 18.04 and later (libgtk-3-0 >>
3.22.30-1ubuntu2 ONLY on ubuntu - not kubuntu).
On Debian systems (stable and testing) and Kubuntu systems of the same
version all things are all right.
A short list, which versions have failures (os and libgtk-3-0 version) :
debian stretch with 3.22.11 is OK
debian buster with 3.24.5 is OK
ubuntu 17.10with 3.22.25-0ubuntu0.1 is OK
ubuntu 18.04 (also LTS version)with 3.22.30-1ubuntu2 failure
ubuntu 18.10with 3.24.4-0ubuntu1 failure
A screenshot of the correct first show of the window an the second on is
attached.
A minimal example would also be attached in a replay to this report.
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