Pinch zoom ux#991

Open

Alpt wants to merge 13 commits intodanvk:masterfrom

Alpt:pinch-zoom-ux

Commits on Apr 9, 2020

swip.dataX was not scaled during the pinch. This caused problems (blow ups in the zoom in/out).
andrea
committed
disallow too small pinches. disable diagonal calculation.
andrea
committed
other fixes/hacks for sensitiveness of pinch-zoom
andrea
committed

Commits on Apr 10, 2020

checking if touches >= 2
andrea
committed
context.pinchOutOfExtremes
andrea
committed

Commits on Apr 11, 2020

Commits on Apr 13, 2020

guard on undefined valueRange / dateWindow
andrea
committed