Allow a build with Qt 6

[tsimonq2]

WIP, since QTerminal doesn't actually display anything yet.

[yan12125]

I prefer to completely move to Qt 6 and drop support for Qt 5. See discussions at lxqt/qtermwidget#468.

Marking as draft for now. Feel free to mark it as ready by yourself later.

[tsimonq2]

Sounds good, thank you @yan12125! 😄

[epasveer]

Sorry to prod. Any update on a Qt6 release for qterminal?

Thanks.

[yan12125]

I prefer to completely move to Qt 6 and drop support for Qt 5.

I updated this branch to include only Qt 6 support. Not tested yet, though.

Sorry to prod. Any update on a Qt6 release for qterminal?

After this branch and lxqt/qtermwidget#532 are merged, qterminal should work with Qt 6.

There is still a technical issue: pyqt support in qtermwidget gets broken during qt 6 migration (see the qtermwidget PR for more details). May need some time to investigate.

[epasveer]

qterminal should work with Qt 6.

Thanks for the update. Looking forward to trying it.

[yan12125]

I noticed some of my local changes overlap with #1110. I will push my remaining changes there.