[LyX/master] Fix backspace deletion of selected items with change tracking

[Kornel Benko]

Am Mon, 13 Jan 2020 14:27:53 +0100
schrieb Kornel Benko <kornel at lyx.org>:

> Am Mon, 13 Jan 2020 14:00:35 +0100
> schrieb Jürgen Spitzmüller <spitz at lyx.org>:
> 
> > Am Montag, den 13.01.2020, 13:54 +0100 schrieb Kornel Benko:  
> > > ! Package fontspec Error: The font "FreeSerif" cannot be found.    
> > 
> > Apparently you need to install this font.
> > 
> > Jürgen  
> 
> No, I have this font. Both compilations dvi3 and pdf5 with system font versions fail,
> but pdf4 does not.
> 
> 	Kornel

It turns out, that the installed font is the cause.
What I had to do:
	1.) Purge package fonts-freefont-otf
	2a.) Try to purge package fonts-freefont-ttf
		Invalid, because this package depends on
		kubuntu-desktop,ubuntu-desktop,ubuntu-mate-core,ubuntu-mate-desktop,vlc-plugin-skins2
		and I need them
	2b.) Copy texlive fonts to system
		#cp /usr/local/texlive/current/texmf-dist/fonts/truetype/public/gnu-freefont/*.ttf /usr/share/fonts/truetype/freefont/.

(I already had enabled the texlive fonts to be used by the system, but somehow
fc-cache prefers the last found font.)

	Kornel
		
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