Admin bar overlayed by IE scroll control

[Clorith]

Exists in both IE 10 & 11

The scroll arrow pointing up overlays the admin bar on the right hand side, not sure if this is actually possible to negate in any way.

This effectively blocks the element under it, but since the "Howdy, User" is such a big element this isn't a problem. On the other hand, plugins using the admin bar may be blocked by this.

[azaozz]

This is a change in IE, it now "hides" the scrollbars and shows them on mouse move.

[Clorith]

Mentioned this for jetpack, and this actually covers the search in the admin bar on the front end as well, which is part of core.

@georgestephanis did find this: ​http://stackoverflow.com/questions/17045132/scrollbar-overlay-in-ie10-how-do-you-stop-that-might-be-bootstrap

[Clorith]

I'm leaning towards a wontfix on this.

Internet Explorer 10 is EOL, and 11 is only supported on machines running Windows 8.1, which will also lose support in January 2023.

Most commonly used areas do not show the scrollbar any more (block editor has its own internal scroll for example), so I think we can safely disregard this and put it in the "doesn't work perfectly, but degraded somewhat gracefully" pile.

Should this become a bigger problem later, we can revisit at that time.