importmatplotlib.pyplotaspltimportnumpyasnpth=np.linspace(0,2*np.pi,512)fig,ax=plt.subplots()ax.plot(th,np.sin(th))ax.plot(th,np.cos(th))ax.set_title(fig.canvas._dpi_ratio)plt.show()

Each of those was launched with

✔19:57:24 $with ${...}.swap(QT_SCALE_FACTOR=2.0): ............python/tmp/tester.py& ............

There is no visual difference between this branch and master.

From what we've seen, I think that should be correct. At least, it seems likesetDevicePixelRatioF andsetDevicePixelRatio do the same thing... Maybe they're there in order to be extra-explicit about types.

Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

$ git checkout v3.2.x$ git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

$ git cherry-pick -m1 3460e0e7b40ab61e0626cfeebb3ae9c22f255d16

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

$ git commit -am 'Backport PR #17640: More qt fractional DPI fixes'

4. Push to a named branch :

git push YOURFORK v3.2.x:auto-backport-of-pr-17640-on-v3.2.x

5. Create a PR against branch v3.2.x, I would have named this PR:

"Backport PR#17640 on branch v3.2.x"

And apply the correct labels and milestones.

Congratulation you did some good work ! Hopefully your backport PR will be tested by the continuous integration and merged soon!

If these instruction are inaccurate, feel free tosuggest an improvement.