QRegExp is deprecated in qt6

[Stephan Witt]

Am 02.03.2023 um 22:44 schrieb Richard Kimberly Heck <rikiheck at gmail.com>:
> 
> On 3/2/23 12:29, Stephan Witt wrote:
>> 
>> ATM, Qt6 is unusable on Mac because of bug 12641. :(
> 
> Does this just mean you can't build with Qt6? Or is this a blocker for release?

No, this means I can build both with Qt5 or Qt6. 
But I don’t know how to fix the bug, so the release shouldn’t be done with Qt6.
It would be a good move to switch to Qt6 with a major release of LyX.
But if it is not possible it’s better to release it with Qt5.

Stephan