[Octave-bug-tracker] [bug #49053] figure scaling issue with Qt 5 on macOS with Retina / HiDPI scaling

[John Swensen]

Follow-up Comment #93, bug #49053 (project octave):

@scchoeps That is strange. It clearly detected the screen change from the
HiDPI to non-HiDPI screen (as evidenced by the change in drawing scale), but
it didn't seem to detect the change from the non-HiDPI screen back to the
HiDPI screen. The exact same screenChanged signal gets fired and the exact
same code should handle both of those transitions identically.

I may put some debugging text output back in there and ask you to try again,
if that is OK. 

Just to confirm:
1) you have QT5?
2) you re-ran the autogen after applying the patch to get the configure
changes in there to look for QScreen::devicePixelRatio?

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