This patch doesn't make a difference, the result is exactly the same.

Sad. Works fine locally on non-HiDPI display.

That means that the proposed by the bug reporter method of testing ("QT_SCALE_FACTOR=1.2 kmplot") does not work. We need a developer with a real HiDPI display.

In D29421#667522, @mthw wrote:

This patch doesn't make a difference, the result is exactly the same.

Could you please test (e.g. by adding qDebug() or printf()) if you are indeed running the kpart from the compiled kmplot instead of the one installed into the system?

I quickly tested this, because I have a high DPI display and sometimes notice pixelated icons etc.
I didn't change any settings/had prior settings for this application.

Master branch (build from source):

With this patch:

In D29421#673387, @alex wrote:

I quickly tested this, because I have a high DPI display and sometimes notice pixelated icons etc.
I didn't change any settings/had prior settings for this application.

Many thanks for testing.

In D29421#673385, @cfeck wrote:

In D29421#667522, @mthw wrote:

This patch doesn't make a difference, the result is exactly the same.

Could you please test (e.g. by adding qDebug() or printf()) if you are indeed running the kpart from the compiled kmplot instead of the one installed into the system?

Looks like I wasn't. After removing installed kmplot and running the built one, everything works fine.