On Fedora KDE 43, this version of Opera Stable (124.0.5705.65) and also Beta 124.0.5705.51, fail to get focus when I click on a link in another app like kmail or akregator, i.e. the website opens but the browser remains out of focus.
Previous Stable didn't show this behaviour, neither did previous versions of Beta.
There's also another issue that Opera Stable and Beta recieve the Alt key in some circumstances. At first I though it was a problem of XWayland apps but it keeps happening with Opera working native Wayland (--ozone-platform=wayland).
Repro: open Opera, open Konsole, Alt+Tab to Opera, Alt+Tab to Konsole, use Alt+F4 to close Konsole, Opera recieves the Alt key and opens its menu.
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.8-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland