Lock vertical scrolling when zoomed in

[newhinton]

Issue Summary

When a user zooms into a pdf (eg if he wants to get rid of a border) and then uses the finger to scroll, the view fully moves with the finger, not only vertically but also horizontally. This can be strange for text only pdfs where the text is then jittery on scrolling.

Afaik this is working as intended, but maybe an improvement would be to "lock" horizontal scrolling when the zoomfactor is above a threshhold

Steps to Reproduce the Problem

Zoom in and use finger to scroll down

Specifications

• App Version: 3.2
• Android Version: lineageos 16.0