[dolphin] [Bug 469397] New: Changing view mode on sshfs mountpoint freezes Dolphin

[Nicolai Weitkemper]

https://bugs.kde.org/show_bug.cgi?id=469397

            Bug ID: 469397
           Summary: Changing view mode on sshfs mountpoint freezes Dolphin
    Classification: Applications
           Product: dolphin
           Version: 22.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: kde-bugs at nicoweio.33mail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
When I mount my TrueNAS server's pool directory using sshfs, Dolphin thinks I
can write into it (right-click shows the "create new file" option), but
actually can't (gives an error message). If per-directory view modes are
enabled, Dolphin therefore tries to save a .directory file upon change, but
fails and freezes. 
This seems to be the relevant part of code:
https://invent.kde.org/system/dolphin/-/blob/master/src/views/viewproperties.cpp#L78


STEPS TO REPRODUCE
1. Have a TrueNAS instance or presumably any remote server where a directory is
not writable (i.e., one cannot create a file in this very directory)
2. sshfs serveraddress:/mnt/mypool /path/to/mountpoint
3. Open /path/to/mountpoint in Dolphin
4. Change the view mode

OBSERVED RESULT
Dolphin freezes

EXPECTED RESULT
Dolphin silently handles the error (and saves the config elsewhere). 
Ideally, it also detects that the directory is not actually writable and hides
menu options accordingly, although I am not sure who is to blame in this case.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro 22.1.0
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
Related: https://bugs.kde.org/show_bug.cgi?id=214560

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