[LyX/master] Remove two remaining snippets from the QRegExp era.

[Scott Kostyshak]

On Sat, Mar 11, 2023 at 04:39:26PM +0100, Jürgen Spitzmüller wrote:
> Am Samstag, dem 11.03.2023 um 10:27 -0500 schrieb Scott Kostyshak:
> > This compiles on my new system, but fails on an old system, with both
> > CMake and Autotools.
> > 
> > CategorizedCombo.cpp: In member function ‘void
> > lyx::frontend::CategorizedCombo::Private::setFilter(const QString&)’:
> > CategorizedCombo.cpp:290:16: error: ‘class
> > lyx::frontend::CCFilterModel’ has no member named
> > ‘setFilterRegularExpression’
> >   filterModel_-
> > >setFilterRegularExpression(charFilterRegExp(filter_));
> >                 ^
> 
> filterRegularExpression was introduced in Qt 5.12.
> 
> > 
> > GCC version: 5.4.0
> > Qt version:  5.5.1
> > 
> > I forget what our minimum current versions are these days. I do not
> > mind if compilation doesn't work for this old system.
> 
> Readme says "at least version 5.2 (5.6 recommended)".

I see, so my system is not recommended but it seems this issue should be fixed for someone with Qt 5.6.

Thanks,
Scott
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