[dolphin] [Bug 439864] New: Dolphin resets to "Home" and forgets paths of all tabs that are not available on start [regression]

[ttrovo]

https://bugs.kde.org/show_bug.cgi?id=439864

            Bug ID: 439864
           Summary: Dolphin resets to "Home" and forgets paths of all tabs
                    that are not available on start [regression]
           Product: dolphin
           Version: 20.12.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: vleett at yandex.ru
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Dolphin resets to "Home" and forgets paths of all tabs that are not available
on start.

The session gets completely lost and even making places available again do not
help to restore information what were the locations of tabs.

STEPS TO REPRODUCE
1. Set "Show on starup" setting to "Folders, tabs, and window state from the
last time" in "Startup" settings of Dolphin.
2. Mount something to some directory, e.g. to /home/user/my/
3. Open several tabs with sub-directories of this mounted place.
4. Close Dolphin
5. Unmount the directory
6. Open Dolphin

OBSERVED RESULT
Dolphin shows several tabs but all of them have "Home" name and no saved path.
Information about previous session is lost.
User has several useless "Home" tabs instead and that's all.

EXPECTED RESULT
All tabs should keep the paths even if those are not currently available (it
can be remounted and session won't be lost).
It always worked like that in previous versions of Dolphin.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 33.
Dolphin: 20.12.2
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
It's a regression, because on older versions of Dolphin I had a red banner that
location is not available with ability to make it available and refresh the
tab.

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