Removes old jquery.putCursorAtEnd plugin and replaces it with a utility function. Also removes fallback for browsers that don’t support
Note also that triggering the
putCursorAtEnd even immediately in
composer-title.js is by design, the delay introduced by
afterTransition breaks setting focus on iOS devices (we currently don’t set focus on iOS, but this PR is step 1 of getting to a point where we can do that).