[Linux]Set as default browser" banner cannot be dismissed

MathieuSpi

MathieuSpi

Environment:

Opera GX: opera-gx-stable 129.0.5823.26 (amd64)
OS: Arch Linux (rolling)
Kernel: 6.19.9-arch1-1
Desktop: KDE Plasma / Wayland (wayland-0)
Shell: fish
CPU: AMD Ryzen 7 7800X3D 8-Core Processor
GPU: AMD Radeon RX 7900 XTX (RDNA3, navi31)
GPU driver: Mesa 26.0.3 (radeonsi, ACO)
Locale: fr_FR.UTF-8

System libraries:

glibc 2.43
Mesa 26.0.3 / vulkan-radeon 26.0.3
Qt6 6.10.2 (qt6-base + qt6-wayland + qt6-tools)
NSS 3.122

Logs collected with: opera-gx --enable-logging --v=1

Bug 1: "Set as default browser" banner cannot be dismissed

Description:
Opera GX shows the "Set as default browser" banner on every launch, even when it IS the system default browser. The banner reappears after every restart.

Verified with:

$ xdg-settings get default-web-browser
opera-gx.desktop

Tested workarounds (none work):

Setting Opera GX as default via xdg-settings set default-web-browser opera-gx.desktop
Creating opera-gx-stable.desktop and setting it as default
Setting "check_default_browser":false in ~/.config/opera-gx/Default/Preferences (overwritten on launch)
Dismissing with X button (reappears on restart)
Installing qtpaths symlink in /usr/bin/

Possibly related log entry:

/usr/bin/xdg-mime: ligne 885: qtpaths: commande introuvable

Opera GX internally calls xdg-mime which requires qtpaths. On Arch Linux, qtpaths is installed at /usr/lib/qt6/bin/ but not in the default PATH. Even after adding a symlink in /usr/bin/, the banner persists.

Note: Opera Stable 129.0.5823.22 does NOT show this banner on the same system.