So, there's this commit:
https://git.qt.io/consulting-usa/qtbase-xcb-rendering/commit/69335920f724d2d4a49924f373c4fef57c942831
"
Move QButtonGroup implementation from qabstractbutton.cpp to
qbuttongroup.cpp
Because it's the right thing to do.
Needed to introduce qbuttongroup_p.h because QAbstractButton
likes to poke around in QButtonGroup's private parts.
Fixed includes of qabstractbutton_p.h so it compiles on it's
own.
Change-Id: Ic7725277d2419754de273b2abd4790476edd0eb4
Reviewed-by: Olivier Goffart's avatarOlivier Goffart (Woboq GmbH)
<ogoff...@woboq.com>
"
Which of course breaks source compatibility. It's bad enough to have to
adapt one's codebase; but this also makes it impossible to bisect code
when Qt 5.11 is installed that had to be adapted.
I'm constantly running into this problem. Would it be too much to ask
that things like this just never ever happen again?
Boudewijn
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