CSS: fix :visible/:hidden selectors for inline element w/ content

- Reverts behavior from 10399dd, which we never released.
  BR and inline elements are considered visible.
- The possibility of dropping .offsetWidth and .offsetHeight
  was debunked by this perf:
  http://jsperf.com/visible-hidden-and-getclientrects

Fixes gh-2227
Close gh-2281

src/css/hiddenVisibleSelectors.js

@@ -4,12 +4,10 @@ define([
 ], function( jQuery ) {
 
 jQuery.expr.filters.hidden = function( elem ) {
-	// Use OR instead of AND as the element is not visible if either is true
-	// See tickets #10406 and #13132
-	return !elem.offsetWidth || !elem.offsetHeight;
+	return !jQuery.expr.filters.visible( elem );
 };
 jQuery.expr.filters.visible = function( elem ) {
-	return !jQuery.expr.filters.hidden( elem );
+	return !!( elem.offsetWidth || elem.offsetHeight || elem.getClientRects().length );
 };
 
 });