IE9: Javascript Dropdowns

[rossriley]

Seems to be a bug with the dropdowns. Spotted both in the top right username dropdown, and on the file-list or content-list Options button dropdown. Hovering over doesn't seem to trigger a dropdown.

[rossriley]

Doing a bit of debugging on it seems this line from the dropdowns js:

            // Prevent breakage on old IE.
            if (typeof mouseEvt === "undefined" || mouseEvt === null) {
                return false;
            }

Does just return false for IE9 so nothing gets shown.