New warning (or at least I only noticed it now)

[José Matos]

Hi,
  I have been compiling and running 2.4 compiled with the latest
preview of gcc 13.

I got a new warning:
"note: the temporary was destroyed at the end of the full expression"

Attached follows an example, there are more I can send if they are
relevant.

Best regards,
-- 
José Abílio
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/home/jamatos/lyx/lyx.anon/src/BufferView.cpp: In member function ‘bool lyx::BufferView::needsFitCursor() const’:
/home/jamatos/lyx/lyx.anon/src/BufferView.cpp:485:47: warning: possibly dangling reference to a temporary [-Wdangling-reference]
  485 |                 frontend::FontMetrics const & fm =
      |                                               ^~
/home/jamatos/lyx/lyx.anon/src/BufferView.cpp:486:39: note: the temporary was destroyed at the end of the full expression ‘lyx::theFontMetrics((*(const lyx::FontInfo*)(&((lyx::BufferView::Private*)((const lyx::BufferView*)this)->lyx::BufferView::d)->lyx::BufferView::Private::cursor_.lyx::Cursor::getFont().lyx::Font::fontInfo())))’
  486 |                         theFontMetrics(d->cursor_.getFont().fontInfo());
      |                         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~