[LyX/master] Change preedit color settings

[Scott Kostyshak]

On Sun, Jul 05, 2026 at 01:24:22PM +0200, Jürgen Spitzmüller wrote:
> Am Samstag, dem 04.07.2026 um 19:07 +0200 schrieb Jürgen Spitzmüller:
> > Am Samstag, dem 04.07.2026 um 16:25 +0200 schrieb Scott Kostyshak:
> > > Starting with this commit, my cursor turns black when it enters a
> > > math
> > > inset. I am using dark mode, in case it is relevant.
> > > 
> > > Can anyone reproduce?
> > 
> > Yes. The reason is that math background has been set to transparent,
> > but the cursor inversion code relies on it being a non-transparent
> > color to determine whether it is dark or light.
> 
> It turned the foreground/background optimization I have recently added
> has been broken by transparent color support.
> 
> I did what I could and have fixed the obvious cases. It is well
> possible that there are more bugs to discover. 

Thanks, Jürgen! Checked and works well.

Scott
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