You have been subscribed to a public bug by postanmb (postanmb):
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 17.10 with 3.22.25-0ubuntu0.1 is OK
ubuntu 18.04 (also LTS version) with 3.22.30-1ubuntu2 failure
ubuntu 18.10 with 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.
** Affects: gtk+3.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: bionic comic ui
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GTK+3.0 window resize problem - only on ubuntu
https://bugs.launchpad.net/bugs/1822768
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