fix for #4512 and minor sizzle updates

src/selector.js

@@ -551,7 +551,7 @@ var Expr = Sizzle.selectors = {
 			} else if ( name === "not" ) {
 				var not = match[3];
 
-				for ( i = 0, l = not.length; i < l; i++ ) {
+				for ( var i = 0, l = not.length; i < l; i++ ) {
 					if ( not[i] === elem ) {
 						return false;
 					}
@@ -565,13 +565,13 @@ var Expr = Sizzle.selectors = {
 			switch (type) {
 				case 'only':
 				case 'first':
-					while ( (node = node.previousSibling) )  {
+					while (node = node.previousSibling)  {
 						if ( node.nodeType === 1 ) return false;
 					}
 					if ( type == 'first') return true;
 					node = elem;
 				case 'last':
-					while ( (node = node.nextSibling) )  {
+					while (node = node.nextSibling)  {
 						if ( node.nodeType === 1 ) return false;
 					}
 					return true;
@@ -977,21 +977,17 @@ jQuery.expr = Sizzle.selectors;
 jQuery.expr[":"] = jQuery.expr.filters;
 
 Sizzle.selectors.filters.hidden = function(elem){
-	var width = elem.offsetWidth, height = elem.offsetHeight;
-	return ( width === 0 && height === 0 ) ?
+	var width = elem.offsetWidth, height = elem.offsetHeight,
+		 force = /^tr$/i.test( elem.tagName ); // ticket #4512
+	return ( width === 0 && height === 0 && !force ) ?
 		true :
-		( width !== 0 && height !== 0 ) ?
-			false :
-			!!( jQuery.curCSS(elem, "display") === "none" );
+			( width !== 0 && height !== 0 && !force ) ?
+				false :
+					!!( jQuery.curCSS(elem, "display") === "none" );
 };
 
 Sizzle.selectors.filters.visible = function(elem){
-	var width = elem.offsetWidth, height = elem.offsetHeight;
-	return ( width === 0 && height === 0 ) ?
-		false :
-		( width > 0 && height > 0 ) ?
-			true :
-			!!( jQuery.curCSS(elem, "display") !== "none" );
+	return !Sizzle.selectors.filters.hidden(elem);
 };
 
 Sizzle.selectors.filters.animated = function(elem){