Sorry I was too slow with testing 😔
Will test from master.

@elalish I finally got to test this; looks like it's nearly fixed!
From zooming around I can see that now all resolutions stay at exactly the same pixel values but 90% and 110% still jump by a pixel, reducing clarity. This means that almost every zoom looks super crisp and sharp but the common values of 90% and 110% are still somewhat blurry.

Without the PR, all values would be slightly different and thus everything was slightly blurry at all but 100% values. Now, only those two jump by a pixel.

(the relevant part is that in the lower right, the <canvas width=518 height=1121> jumps to <canvas width=519 height=1122> when zooming at 90% and 110%.

@hybridherbst Thanks for verifying. Let's see if this second PR fixes it, as Three wasn't using the same kind of rounding I was.