(closes#4533)
There are several issues here.. Here's a quick brain dump:
- the requestIdleCallbacks in map.js (scheduleRedraw) seem to be causing
crashiness in Firefox on fast zoom/unzoom, mousewheel, etc.. anything where
the view transform changes a lot and the redraws don't catch up.
(commented out, reverted back to lodash throttle)
- the requestIdleCallback worker queue in idle_worker.js seems to be causing
crashiness in Firefox and Chrome when exiting the walkthrough. Something about
deferring the tile parsing as the user leaves the intro has a problem.
It might be an infinite `while` loop, not sure.
(commented out, reverted back to for loop)
- the requestIdleCallback in call_when_idle.js is only used to defer
tile loading in context.loadTiles() - this one seems fine, and actually
has maybe the biggest benefit for improving performance.
(left in)
