display of $int...$ under QT5

[Enrico Forestieri]

On Wed, Sep 02, 2020 at 05:49:38PM +0200, Enrico Forestieri wrote:
> On Wed, Sep 02, 2020 at 03:08:52PM +0200, Cor Blom wrote:
> > Op 02-09-2020 om 14:39 schreef Enrico Forestieri:
> > > As regards where to put the fonts, you have the choice of leaving
> > > them where they are installed by lyx (and, at least on debian, lyx
> > > is able to find and use them), or package them separately and
> > > register them with fontconfig. In this case, they can also be used
> > > by other packages.
> > > 
> > > I really have no idea why it does not work for you.
> > 
> > My guess is: debian and fedora do not install texlive fonts in the default
> > /usr/share/fonts directory. opensuse does. I can disable the texlive fonts
> > and then all is working fine. If I don't there is a chance the wrong font is
> > used.
> 
> I can confirm your guess. By making the texlive fonts available through
> fontconfig I can reproduce all your results. Independently of whether
> the debian package fonts-lyx is installed or not.
> 
> This definitely is a Qt issue, because the debug patch is still able to find
> the right fonts. I don't think there is anything we can do. So, either choices
> about where to put lyx fonts will work, provided that the texlive fonts
> are left out from fontconfig management.

On second thought, I think we can workaround this Qt limitation. I checked
that specifying the foundry name other than the style, Qt is able to
discriminate our fonts even when the texlive fonts are managed by fontconfig.

I changed the foundry name from "PfEd" to "LyEd" and it works on debian.
Please try the attached patch for the development version (it's a git
binary patch, so you have to use "git apply") and report back whether it
also works for you.

-- 
Enrico
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