https://bugs.kde.org/show_bug.cgi?id=466373

--- Comment #10 from David Edmundson <k...@davidedmundson.co.uk> ---
>David, what do you think about this?

You'll fix 95% of cases, I did most my dev work against Qt5. The problem is
there's 5% that will explode massively. Most notably systemsettings.

There's a bug with QQuickWidget and fractional scaling, that we have a
workaround for that uses Screen.dpi; but our screen DPI is an integer so that
thing fails. (I assume that's what Dobroslaw is referring to)

There's also the issue of communicating changes; Qt only looks for DPR changes
when the screen changes. Get that out of sync and you're in trouble. I added
new code to QtBase for that, but that's not easy to backport, there's new
events.

Backporting alone isn't enough. There's a lot more to do on top. I'm not sure
it's worth it.

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