should be able to compile with Qt6

[vladimir-kraus]

When trying to build with Qt6, there are several deprecation related errors.

[randrew]

Do you have a list?

[shinespeciall]

msvc compiler gives me these: the first error means: invalid Preprocessor command "warning", it only works in gcc? gcc gives me these: perhaps don't need a lot of changes to port to Qt6

[randrew]

I think that's not too bad. Replace .background() with .window() to fix most of them.

[jcelerier]

Another one is that tabWidth in QStyleOptionMenuItem has changed in reservedShortcutWidth:

#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
   int tabWidth = menuItem->tabWidth;
#else
   int tabWidth = menuItem->reservedShortcutWidth;
#endif

I have it working in Qt6 (at least haven't noticed any remaining issue) in my fork, I can make a PR if you want @randrew

[jcelerier]

hmm since 6.3 / 6.4 some UI glitches have appeared though, which seem to be due to the QPalette hash. Replacing fastfragile_hash_qpalette with accurate_hash_qpalette fixes it.

[randrew]

Thanks for letting me know. I'll take a look when I get around to updating this for Qt6. It relies on the internals of the QPalette data to do a fast 'hash'. It only saves a little bit of work, which I think is nice for frequent small drawing operations, but using the fallback 'accurate' hash is not that big of a deal for now.