[Bug 273937] x11-wm/plasma5-kwin with x11/nvidia-driver-470: occasional title bar failures on at least one external display, worked around with kwin_x11 --replace

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273937

            Bug ID: 273937
           Summary: x11-wm/plasma5-kwin with x11/nvidia-driver-470:
                    occasional title bar failures on at least one external
                    display, worked around with kwin_x11 --replace
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://bsd-hardware.info/?probe=7339d12365
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: grahamperrin@gmail.com
                CC: danfe@FreeBSD.org, kde@FreeBSD.org
                CC: danfe@FreeBSD.org, kde@FreeBSD.org

<https://www.freshports.org/x11-wm/plasma5-kwin/>
https://www.freshports.org/x11/nvidia-driver-470/

The internal hard disk drive that I previously used in an HP-docked HP
EliteBook 8570p (using radeonkms) is now in a superior, identically-docked HP
ZBook 17 G2 (using nvidia-modeset). 

Amongst the first things observed after the upgrade: on a docked display, title
bars were present and somewhat responsive (a click would bring the window to
front), however the close, minimise, and maximise icons within the bar were
colourless. 

With a more recent recurrence of the bug: the title bar was outdated for a
Firefox window with multiple tabs. The title in the bar did not match the title
of the current tab. 

With the most recent recurrence: the most remarkable side-effect was flickering
upside-down appearance of a window from a background application (HexChat). The
attached screenshot was taken after bringing HexChat to front. 

Flickering upside-down ceased after the windowing-specific workaround below. 

My current sense of things is that this bug bites only after wake from sleep
(resume after suspend). 

As far as I can tell: the workaround below is consistently good. 

kwin_x11 --replace

----

Side note: on one previous occasion, KRunner, which I use to run the command,
remained on screen after (windowed) title bars returned to normal. Keying
Escape did not close the window, so I used htop to kill the process.

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