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

[Scott Kostyshak]

On Fri, Mar 03, 2023 at 10:16:30AM +0100, Jean-Marc Lasgouttes wrote:
> commit 309f8f4b40018a5bbd1d873aa9cac89261b96840
> Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
> Date:   Fri Mar 3 11:17:58 2023 +0100
> 
>     Remove two remaining snippets from the QRegExp era.
> ---
>  src/frontends/qt/CategorizedCombo.cpp |    4 ----
>  src/frontends/qt/LayoutBox.cpp        |    4 ----
>  2 files changed, 0 insertions(+), 8 deletions(-)

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_));
                ^

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.

Scott
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