display of $int...$ under QT5

[Cor Blom]

Sorry to jump very late in this threat, only saw it today.

I don't use LyX for math, so that part I don't know anything about, but 
I use openSUSE and maintain LyX there, so I am interested to get this right.

By default I disable all texlive fonts for the UI by linking the 
58-texlive-* config files in /etc/fonts/avail.d to /etc/fonts/conf.d (on 
openSUSE Tumbleweed the first directory is now in 
/usr/share/fontconfig/avail.d). As far as I can see the esint fonts are 
working nicely in LyX. Enabling those fonts by removing those 
58-texlive-* files again by removing them from /etc/fonts/conf.d has the 
result that I see what Bernhart saw, I think.

If the cause is how LyX is packaged in openSUSE, please file a bug in 
the openSUSE bugzilla. If it's mentioned here, the chance is I'll miss it.

BTW: the LyX fonts are packaged in /usr/share/lyx/fonts and not linked 
in any way to /usr/share/fonts.

Thanks,

Cor

Op 25-08-2020 om 11:22 schreef M.B. Schiekel:
> Am 24.08.20 um 18:02 schrieb Jean-Marc Lasgouttes:
>>> After a longer discussion here I found, that the cause of this problem
>>> was the interaction of LyX with QT5-Qt-5.9.4. Then I compiled LyX with
>>> QT4 and this workaround was fine for me.
>>> Now with LyX 2.3.5.2 there is the same problem with QT5-5.12.7 and again
>> ...
>> Unfortunately, it is not my failing memory that prevented from fixing
>> the bug. Since I cannot reproduce it, it is difficult for me to do
>> something about it.
>>
>> Let's start by a shot in the dark: does it make a difference to set the
>> environment variable QT_HARFBUZZ to "old" ?
>>
>> Even if it does, I suspect it will not be enough for a long-term fix.
>>
>> Did I understand correctly that you can compile LyX? Does it mean that
>> you can try a patch too? A possibility is that Qt does not like (ass
>> Pavel noted) to have a font with a character at position 1 (which is
>> where \int lives in esint10 font). We would have to duplicate the
>> character somewhere else in the font.
>> ...
> 
> 
> Hi Jean-Marc,
> 
> thank you for your kind reply. This morning I tried to compile LyX
> 2.3.5.2 with your suggested environment-variable
>    export QT_HARFBUZZ=old ,
> and yes, it works, all integral-signs are Ok.
> 
>> Did I understand correctly that you can compile LyX? Does it mean that
>> you can try a patch too?
> Well, I can compile LyX. Concerning an patch I can try - depends if this
> patch will automatically change the sources, because I don't want to
> make changes in the sources by hand :-)
> 
> So far, so good. And many thanks for all your wonderful LyX-work!
> bernhard
> 
>