This helps fix issues that make tooltip tests sometimes fail when run against
jQuery 3.2 or newer due to timing differences.
Details:
* Add the `moduleAfterEach` function ensuring no timers are running.
* Attach this function via `common.testWidget`.
* Attach this function to most test suites.
* Add a tooltip test helper cleaning up leftover timers.
* Rename legacy `setup`/`teardown` hooks to `beforeEach`/`afterEach`.
Closes gh-1920
I was running into a problem with a popup menu control in a dialog; clicks
weren't working (but keyboard was working fine). It turned out that the menu
was getting destroyed before the click event could fire.
Tracked down the issue to the way draggable blurs focused controls; it was
doing the blur before it ran through the logic to figure out if the drag was
actually on the handle. I've moved the blur below these checks, so it'll only
blur things if it actually needs to handle the drag. Otherwise, it asserts no
opinion on what should and shouldn't be focused, which seems like the way
things ought to be.
Also, added a unit test to check for the expected behavior.
Fixes#15046
Closes gh-1730
