Bug 503181

SUMMARY
I had previously customized my toolbar in Dolphin, (adding buttons for Create Folder, Refresh, Terminal, removing Location Bar (which moves it to a separate bar), and added an expanding spacer before Open Menu). Since upgrading to 25.04, these customizations have been lost - the toolbar has reverted to defaults. I can recreate them again, but I was wondering if that was expected behavior of the upgrade?

STEPS TO REPRODUCE
1. Open Dolphin version 24.12.3
2. Customize the toolbar (add/remove some buttons)
3. Upgrade to Dolphin 25.04
4. Look at toolbar

OBSERVED RESULT
Toolbar has reverted to defaults.

EXPECTED RESULT
Toolbar was same as before.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20250418
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0
Kernel Version: 6.14.2-1-default (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION
I'm aware of https://invent.kde.org/system/dolphin/-/merge_requests/894 which merged the three view buttons into one. Maybe that has caused all the other buttons to reset to default too?

Also, I read at https://discuss.kde.org/t/dolphin-forgetting-keyboard-shortcuts/33174 that another user has lost their keyboard customizations since upgrading to 25.04. I haven't customized my keyboard shortcuts in Dolphin so I cannot confirm that, but thought it worth mentioning in case there is a more general issue with customizations being lost with an upgrade to 25.04.