I've tried to build with Qt 5.12.0
Got this error:
No rule to make target QtQuickWidgets/QQuickWidget, needed by ui_ImageWidget.h
Any idea what that might be?
How did you install Qt 5.12? (Qt Installer or Homebrew?)
Qt 5.12 marks QtQuickControls 1 as deprecated. You may need to install them separately (i.e. select it in the Qt Maintenance tool). See https://wiki.qt.io/New_Features_in_Qt_5.12
Haven't tested in on Mac, yet. So I'm not sure :-)
Can reproduce this issue. Will look into it. :)
How did you install Qt 5.12? (Qt Installer or Homebrew?)
Both of them
Qt 5.12 marks QtQuickControls 1 as deprecated. You may need to install them separately (i.e. select it in the Qt Maintenance tool)
It doesn't exist :(

Build x64 version for Windows. No such problem...
CI build is no failing as well. :/
Works again :-)