It may be easier to show the expected behaviour with a video:
https://www.youtube.com/watch?v=vgGnPTgQqjo
The important thing is that text visual size and window visual size is kept in
sync as the system DPI changes. From the report I got the impression that this
was maybe not the case - but that could be a misunderstanding.
From there it's possible to go into the details: there are multiple coordinate
systems, window and text sizes are (approximately) constant in one coordinate
system but changes in another. Long discussions can be had :)
But fortunately, Qt apps can for the most part ignore this and continue to
assume a single coordinate system at 96DPI.
- Morten
> On 9 Feb 2021, at 18:17, Friedemann Kleint <[email protected]> wrote:
>
> Hi,
>
> it seems there is a misunderstanding here: Qt High DPI scaling preserves the
> point-size of the fonts; they are sized according to the system metrics.
>
> All it does is pretend a lower resolution to the application so that apps
> written for 96DPI continue to work.
>
> It is not a means of zooming the application (as opposed to QT_SCALE_FACTOR ).
>
> Regards, Friedemann
>
> --
>
> Friedemann Kleint
> The Qt Company GmbH
>
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