[LyX/master] Allow compiling with Qt6

[Kornel Benko]

Am Tue, 16 Mar 2021 15:43:59 +0100
schrieb Enrico Forestieri <forenr at lyx.org>:

> On Tue, Mar 16, 2021 at 11:08:03AM +0100, Kornel Benko wrote:
> > 
> > Why not use QRegularExpression as in src/lyxfind.cpp?  
> 
> What do you mean? Unconditionally replacing QRegExp? I don't think it
> can be done without dropping support for Qt4.
> 

I meant instead of Compatibility directly use QRegExp or QRegularExpression

	if (QT_VERSION >= 0x050000) {
		// define some macros for QRegularExpression
	}
	else {
		// define some macros for QRegExp
	}

But that is maybe too much work.

	Kornel
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