Pinch-to-zoom gesture zooming works, but the canvas moves horizontally at the same time. Zooming out moves canvas to the left and zooming in moves to the right. Its like zooming works relative to the middle of the left edge of the screen. Pinch-to-zoom gesture works like you'd expect on Marble. This happens on Wacom Cintiq 27qhd.
Zoom gesture works as expected when cintiq is the only display. What I described happens with another display on the left of the cintiq.
Unfortunately, our only cintiq doesn't work well with Linux, and doesn't seem to register touch events at all on Linux, so I am unable to try to reproduce the issue.
It could be something that https://phabricator.kde.org/D8167?id=20418 is supposed to fix...
Then I guess we can close this bug, since the patch was pushed.