[Bug 277502] x11/slim: black display after x11/xcb-proto and x11/libxcb upgrade

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277502

--- Comment #12 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
It's probably not slim-specific, but more general breakage. While testing
Plasma6 built from tcberner@ ports overlay repo, I found another clue.
Initially, there weren't any problems with KDE apps, but at some point
communication with xcb broke, and apps were no longer able to start:

% dolphin 
Authorization required, but no authorization protocol specified

qt.qpa.xcb: could not connect to display :0
qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the
Qt xcb platform plugin.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it
was found.
This application failed to start because no Qt platform plugin could be
initialized. Reinstalling the application may fix this problem.

Available platform plugins are: wayland, vnc, minimal, xcb, wayland-egl,
offscreen, vkkhrdisplay.

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