From https://www.qt.io/blog/2019/08/07/technical-vision-qt-6
I learned that Qt 6.0 may be ready for a first release by the end of 2020.
And GNU TeXmacs is still using Qt 4.
Personally, I hope that GNU TeXmacs can switch to Qt 5 before the
release of Qt 6.0 .
It would be a heavy burden to maintain C++ code that work for both Qt 4
and Qt 5.
I suggest that once we switch to Qt 5, we may stop support Qt 4 and
start experimental support for Qt 6.
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