Bug 442753

STEPS TO REPRODUCE
1. have 1 instance of Dolphin running
2. if Dolphin has 1 tab, open another tab and restart Dolphin
If Dolphin already has 2 or more tabs, go to step 3
3. launch another instance of Dolphin via apps launcher: this new instance has the same tabs as instance that was already running
4. close the instance launched in the step 3
5. create a new instance by pressing ctrl+n: this new instance only displays the contents of Home
6. close the instance created in the step 5
7. launch a new instance via apps launcher again: as opposed to the instance that was also launched via apps launcher in the step 3, this new instance does not have the same tabs as instance that was already running

EXPECTED RESULT
The current behavior seems a bit confusing to me.
I expect the same behavior of internet browsers that save tabs of the previous session. Their new instances/windows never include tabs from another instance/window. They open with a start page or web page(s) configured by the user instead. I think that new instances of Dolhpin should not include tabs from another one.

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.23.80
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.3
Graphics Platform: Wayland