Bug 447376

SUMMARY
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When I start a Plasma Wayland session, open Dolphin and the integrated terminal, then focus another window and right-click Dolphin's integrated terminal, the menu has a title bar and appears in the wrong spot.

STEPS TO REPRODUCE
1. Open a Dolphin window and press F4 to open the integrated terminal.
2. Open or focus another window (eg. Firefox).
3. Right-click Dolphin's integrated terminal.

OBSERVED RESULT
The right-click menu has a title bar named Dolphin, and opens near the top-right of the display. 

EXPECTED RESULT
The right-click menu looks like a menu and opens at the mouse cursor.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.2
Kernel Version: 5.15.10-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: llvmpipe

ADDITIONAL INFORMATION
I'm using kwin_wayland built from the v5.23.4 Git tag, and I modified Options::loadCompositingConfig() to assume KWIN_COMPOSE=Q (since I'm testing QPainter compositing and my GPU is stuck on EGLStreams). I'm 80% confident this bug appears on regular kwin_wayland with KWIN_COMPOSE=Q, but I'm not sure if this bug appears with regular compositing.