TabContainer: IE8 high contrast closeable tabs too tall

[haysmark]

You should also be able to see this in a11y mode:

​http://archive.dojotoolkit.org/nightly/checkout/dijit/themes/themeTesterQuirk.html?theme=tundra&dir=rtl&a11y=true

In the Closable tab in the upper left, the x character rendered in place of the usual x icon is too big, so the Closable tab is taller than the others. This only affects IE8 high contrast.

[bill]

I do see that, and it's not surprising it happens, since the [x] has a border, thus increasing it's height. That's from my change in [22187], I'll do something without a border, although that will lose the close button hover effect in high contrast mode (not that most things have a hover effect in high contrast mode).

[bill]

(In [23727]) Don't put border around TabButton close text [x] (shown in high contrast mode instead of icon). It was causing unequal height of tabs. Fixes #11180, refs #11155.