Problem with frame inset

[Jürgen Spitzmüller]

Am Sonntag, dem 17.09.2023 um 22:54 +0200 schrieb Dan via lyx-users:
> I am having a problem with frame insets and would like to see if
> anyone else has realized or can reproduce this problem. Important:
> this only happens with dark theme.

This is since "InsetLayout Box" (in stcinsetc.inc) sets the label color
to "foreground" (the text color), which is not a good idea in dark
mode. Setting it to static "black" fixes the issue. I'll do this in
master.

-- 
Jürgen