Broken 2.3 -> 2.4 conversion for branch

[Jürgen Spitzmüller]

Am Freitag, dem 01.09.2023 um 22:05 +0200 schrieb Pavel Sanda:
> when I create new branch in documt of 2.3 it has black background (my
> default, I use dark theme now as well).
> After opening this file in 2.4 it has white background.
> 
> Looking at the 2.3 .lyx file I see that the branch contains this
> defintion:
> \color #000000
> but once I open and resave this file in 2.4 I see
> \color #000000 #ffffff
> 
> It seems that the second value is used as background, so the
> conversion 
> #000000 -> #ffffff seems wrong.

Specific dark colors are a new feature of 2.4. So as dark mode was not
supported in 2.3, we assume light for all colors used.

-- 
Jürgen