[dolphin] [Bug 503576] New: Focus is split between split view panes when starting with split view and remembering of last used folders & tabs is disabled

[Jan Rathmann]

https://bugs.kde.org/show_bug.cgi?id=503576

            Bug ID: 503576
           Summary: Focus is split between split view panes when starting
                    with split view and remembering of last used folders &
                    tabs is disabled
    Classification: Applications
           Product: dolphin
           Version: git-master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Keywords: regression
          Severity: normal
          Priority: NOR
         Component: split view
          Assignee: dolphin-bugs-null at kde.org
          Reporter: jan.rathmann at gmx.de
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
When starting Dolphin with Split view enabled and without remembering the last
used folders and tabs, the two split view panes end up in a weird limbo state
of splitting the keyboard and mouse focus between them, while both are looking
as if they were "sort of focused" (see screenshot).

STEPS TO REPRODUCE
1. Start Dolphin, go to Settings -> Interface -> Folders & Tabs
2. Select "Show on startup: /home/yourusername (or any other folder)"
3. Enable "New windows: Begin in split view mode"
4. Close Dolphin, start Dolphin again.

OBSERVED RESULT
* Both split view panes have the same background color, and the location bar is
grayed out on both panes.
* The left pane has keyboard focus (to test, press arrow down on keyboard), but
the right pane has focus for opening folders via mouse click on the places
panel, and also for the toolbar button that closes the active split view pane!
* This weird state is ended by either opening a directory via double-click in
one of the split views, or by opening one of Dolphin's modal dialog windows
(like Settings, Keyboard Shortcut configuration etc.).

EXPECTED RESULT
Visual distinction which of the two panes has focus, with both keyboard and
mouse focus applying to the same pane.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.3.80
KDE Frameworks Version: 6.14.0
Qt Version: 6.8.3

ADDITIONAL INFORMATION
Reproduced with
* Dolphin + Plasma build from master on Kubuntu 25.04
* Neon Unstable live image in a VM

On Dolphin 25.04 (Neon User live image) the bug is absent, so it seems to be a
recent regression on master.

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