Several GTK issues on latest Ubuntu release
crschnick at xpipe.io
Mon Oct 23 13:05:01 UTC 2023
a user of our application xpipe <https://github.com/xpipe-io/xpipe>
reported several issues after upgrading their Ubuntu version and I
investigated them myself. I want to note here that these issues are
exclusive to new Ubuntu versions. I did not observe any of them on
slightly older Ubuntu versions or other Gnome-based desktop
environments. I don't know exactly which versions are affected, but
22.04 works fine and Ubuntu 23.10 does not.
I'm sorry that I'm not able to create fully reproducible examples or dig
deeper into the causes here, but I'm very constrained on time right now.
For reproduction, I just installed a new default Ubuntu 23.10 VM and
launched the JavaFX 21 application straight out of the box.
The first issue is that windows do not retain their information when
being hidden and then shown again. I.e. after being shown for the second
time, they will have tiny dimensions and an GTK error is printed to
stderr about height < 0. For now I temporarily resolve this by doing the
following, which somehow fixes the issue:
// Due to some weird GTK bug, we have to set these sizes every
time we show a window again even though they have been previously set
Furthermore, while this is technically not purely JavaFX related, there
is also a total freeze of the platform thread when it calls
javax.swing.UIManager.setLookAndFeel as it gets stuck in some GTK
implementation method. This is called by the fxtrayicon library, which
calls this method here
Since there is no native JavaFX tray integration, calling these
awt/swing related methods is quite important for applications trying to
use the system tray. This was a very unfortunate issue for us as it
caused applications to not start up at all on affected systems.
I wasn't able to compare the behavior to Ubuntu 22.04 as
SystemTray.isSupported() returns false on Ubuntu 22.04 but returns true
on Ubuntu 23.10. Should this even return true on Ubuntu now or is this a
Again, these issues only occur on the very latest Ubuntu release. I have
tested on a lot of other different distros, old and new, and they all
Best regards, Christopher
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