panOnlyWhenZoomed doesn't allow to zoom out on Android Chrome 56

[adamromero]

Subject of the issue

When setting panOnlyWhenZoomed: true, after pinch zooming, I'm unable to zoom out, instead the image jumps around. This specifically appears to happen when you pinch zoom, lift finger tips from the screen, and then, try to zoom out. Zooming in and out seems to work as long as you continue to touch the screen. Works perfectly on Firefox, haven't tried other browsers or devices.

Your environment

• jquery.panzoom 3.2.2
• jquery 2.2.4 & 3.1.1
• Chrome 56 on Android

Steps to reproduce

Open this on chrome 56 on mobile device.
https://adamromero.github.io/issue/

Expected behaviour

Should be able to zoom out when only allowing panning on zoomed image

Actual behaviour

Can't zoom out on zoomed image using panOnlyWhenZoomed.

[inuyaksa]

Same as #303 (fixed with my pull request #330)

[jcnventura]

Duplicate of #303