Bug 491872

SUMMARY
As mentioned in https://github.com/xournalpp/xournalpp/issues/5198 
When launching xournal++ (xournalpp) no window appears, but also no error log gets created in ~/.config/xournalpp. The app is running in the background but no window appears. In X11 mode it runs just fine. This has been an issue for almost a year, it has been confirmed by the app developer that it is a plasma bug and that they don't see what they could fix on their side.
When launching through terminal I get the following:
```
xopp-Message: 10:13:58.352: TEXTDOMAINDIR = (null), Platform-specific locale dir = /usr/share/xournalpp/../locale, chosen directory = /usr/share/xournalpp/../locale
ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = Nie ma takiego pliku ani katalogu
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Cannot connect to server socket err = Nie ma takiego pliku ani katalogu
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
xopp-Message: 10:13:58.433: Plugin "MigrateFontSizes" UI initialized
```
And the process keeps running after that, but with no window.

If I do `xournalpp --disable-audio` the output is much shorter:

```
xopp-Message: 10:14:19.553: TEXTDOMAINDIR = (null), Platform-specific locale dir = /usr/share/xournalpp/../locale, chosen directory = /usr/share/xournalpp/../locale
xopp-Message: 10:14:19.561: Plugin "MigrateFontSizes" UI initialized
```

The process again keeps running, but with no window

STEPS TO REPRODUCE
1. Install xournal++ on any distribution running Plasma in Wayland mode
2. Run xournal++ from the shortcut or terminal, no window will appear
3. Run `xournalpp --disable-audio` - same result
4. Run the app in X11 mode `GDK_BACKEND=x11 xournalpp` - the app launches just fine

OBSERVED RESULT
On plasma the app only runs in X11 mode

SOFTWARE/OS VERSIONS
Linux:  Solus 4.5
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Could it be related to this? https://bugs.chromium.org/p/chromium/issues/detail?id=1268758