[PB 6.21 Beta 9] Linux: Singe instance setting is not working

[macros]

Under Kubuntu 25.04 the IDE opens multiple instances even though the single instance setting is set.
This happens under Wayland and X11 sessions.

If launched while another instance is running the IDE will complain that it has not quit correctly and ask to open the session history.
If a *.pb file is opened it opens in a new instance.

[AZJIO]

Check out purebasic_gtk2
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