Problems:
* `title` attribute of links are not removed on `focus`, causing qunit test failure (locally only, for some reason)
* Sometimes on `mouseover` the `title` attribute is not removed at all. Reproduce by showing the popup over first link at https://en.wikipedia.beta.wmflabs.org/wiki/25thjuneChrome from fresh page reload (and inspecting the element). Cannot find consistent manner in which to reproduce, but it happens frequently.* Repro steps:
1. Run qunit tests locally, observe failure of 3rd assertion in `ext.popups.core: removeTooltips` test. Alternatively, try manually tabbing focus onto a link with popups enabled.
* Sometimes on `mouseover` the `title` attribute is not removed at all.
** Repro steps:
1. Go to https://en.wikipedia.beta.wmflabs.org/wiki/25thjuneChrome (fresh page reload)
2. Inspect first link ("List of books about Wikipedia"), observe `title` attribute is present.
3. Hover over link, observe `title` attribute is not removed. Repeat steps 1-3 if it is removed. Cannot find consistent manner in which to reproduce, but it happens frequently.
* The `title` attribute is sometimes not restored on `mouseout`, breaking it for the rest of the page session.
** Repro steps:
1. Reproduce by showing and hiding the popup over first link atGo to https://en.wikipedia.beta.wmflabs.org/wiki/25thjuneChrome (and inspecting the element)fresh page reload)
2. Inspect first link ("List of books about Wikipedia"), observe `title` attribute is present.
3. Hover over link, observe `title` attribute is properly removed. (Repeat step if 2nd problem above is encountered.)
4. Mouse off of link, observe `title` attribute is properly restored. (Usually is on first try, anyways.)
5. Repeat step 3-4, observe `title` attribute is not restored. Cannot find consistent manner in which to reproduce, so repeat steps 3-4 until it happens.
Note that //none// of these problems appear to be race conditions. Usually happens on 2nd or 3rd `mouseover`They all occur even if you wait for scripts to fully load and animations to complete.