Fix enabling of media object action buttons #5947
Merged
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On page load, both initial and refreshed, in mobile browsers there was some sort of race condition that was disabling the Add to Playlist, Timeline, and Thumbnail buttons immediately after being enabled. Changing the event listener for disabling the buttons to be triggered on the player emptying instead of loading seems to fix that race condition, but uncovered a separate one when switching canvases. This second race condition behaved similarly to the first, where the enabling function would be run before the disabling function. Adding a fallback enabling function that triggers on loadstart seems to fix this second race condition. There may still be some flakiness, especially on apple devices, because events triggering properly sometimes just doesn't happen.
Related issue: #5885
Wait to merge until after 7.8