Drag binding issue on two mouse buttons pressed at the same time

[AlexScheauaStefanini]

This bug occurs when you drag an element (mouse leftclick is down) and you also right click.
It basically binds the element to the pointer via a mousemove event.

I found a fix for this:
In dist/displace.js on line 302 i added this if statement:

displace/dist/displace.js

Line 302 in 12561b1

events.mousemove = mousemove.bind(this, wOff, hOff);

if(e && e.button === 0)
events.mousemove = mousemove.bind(this, wOff, hOff);

it basically binds the mousemove event only if the event is triggered by the leftclick.

[catc]

Can you check this works across browsers (firefox + safari + chrome) and submit a PR?

[AlexScheauaStefanini]

I checked this in edge chrome firefox and safari. It works well. Just created a PR.

[catc]

Fixed: 2df8fff