.postbox .hndle in backend needs border-radius

[Jick]

.postbox div's in the backend have border-radius: 3px but the .postbox .hndle h3's do not. This results in a slight visual problem. The background of the .postbox .hndle h3's spill outside of the radius of the parent .postbox div's.

I have attached a screenshot comparison. It's not easy to see on the default grey scheme but it seems more apparent on the blue scheme. You should be able to test for yourself.

More specifically, I think the .postbox .hndle h3's need this:

.postbox .hndle {
	-moz-border-radius-topleft: 3px;
	-moz-border-radius-topright: 3px;
	-khtml-border-top-left-radius: 3px;
	-khtml-border-top-right-radius: 3px;
	-webkit-border-top-left-radius: 3px;
	-webkit-border-top-right-radius: 3px;
	border-top-left-radius: 3px;
	border-top-right-radius: 3px;
}

I would have attached a patch but I'm not sure of the current state of the admin CSS. Like, I'm not sure exactly where this code goes.

Comparison

In [18773]:

Add border radius to .postbox .hndle, props Jick, fixes #18657