SUMMARY
I have the OpenExternallyCalledFolderInNewTab setting ("Keep a single Dolphin window, opening new folders in tabs") enabled in Dolphin, but despite this, using my Meta+E keyboard shortcut to launch Dolphin will always create a new window. In previous versions, it would either open $HOME in a new tab, or focus an existing tab that's already in that directory. If I instead launch Dolphin using a path as an argument (e.g. `dolphin ~`), then it behaves the way I would expect it to without the argument.

STEPS TO REPRODUCE
1. Verify that OpenExternallyCalledFolderInNewTab=true in ~/.config/dolphinrc
2. Run the command `dolphin` without providing any arguments

OBSERVED RESULT
Launching Dolphin without arguments always creates a new window.

EXPECTED RESULT
If the setting is enabled, launching Dolphin without arguments should open a new tab for whichever startup location is configured (or focus an existing tab if a relevant one exists), and only open a new window if no windows currently exist.

SOFTWARE/OS VERSIONS
Dolphin: 24.12.0
Linux: 6.12.8-arch1-1
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1