Customizer: Revert [26548], removing _.isEqual() for proper object comparison.

This broke the customizer in IE 11, with possibly other side effects. Revisit in 3.9.

Also reverts [26632].

see #26061 (reopens), fixes #26438.

Built from https://develop.svn.wordpress.org/trunk@26702


git-svn-id: http://core.svn.wordpress.org/trunk@26592 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/customize-base.js

@@ -176,7 +176,7 @@ window.wp = window.wp || {};
 			to = this.validate( to );
 
 			// Bail if the sanitized value is null or unchanged.
-			if ( null === to || this.isEqual( to ) )
+			if ( null === to || this._value === to )
 				return this;
 
 			this._value = to;
@@ -251,77 +251,6 @@ window.wp = window.wp || {};
 				this.unlink( that );
 			});
 			return this;
-		},
-
-		/**
-		 * Internal recursive comparison function for `isEqual`.
-		 * Copied from Underscore.js.
-		 */
-		/* jshint ignore:start */
-		_eq: function(a, b, aStack, bStack) {
-			if (a === b) return a !== 0 || 1 / a == 1 / b;
-			if (a == null || b == null) return a === b;
-
-			var className = toString.call(a);
-			if (className != toString.call(b)) return false;
-			switch (className) {
-				case '[object String]':
-					return a == String(b);
-				case '[object Number]':
-					return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b);
-				case '[object Date]':
-				case '[object Boolean]':
-					return +a == +b;
-				case '[object RegExp]':
-					return a.source == b.source &&
-								a.global == b.global &&
-								a.multiline == b.multiline &&
-								a.ignoreCase == b.ignoreCase;
-			}
-			if (typeof a != 'object' || typeof b != 'object') return false;
-			var length = aStack.length;
-			while (length--) {
-				if (aStack[length] == a) return bStack[length] == b;
-			}
-			var aCtor = a.constructor, bCtor = b.constructor;
-			if (aCtor !== bCtor && !((typeof aCtor === 'function') && (aCtor instanceof aCtor) &&
-									(typeof bCtor === 'function') && (bCtor instanceof bCtor))) {
-				return false;
-			}
-			aStack.push(a);
-			bStack.push(b);
-			var size = 0, result = true;
-
-			if (className == '[object Array]') {
-				size = a.length;
-				result = size == b.length;
-				if (result) {
-					while (size--) {
-						if (!(result = this._eq(a[size], b[size], aStack, bStack))) break;
-					}
-				}
-			} else {
-				for (var key in a) {
-					if (hasOwnProperty.call(a, key)) {
-						size++;
-						if (!(result = hasOwnProperty.call(b, key) && this._eq(a[key], b[key], aStack, bStack))) break;
-					}
-				}
-				if (result) {
-					for (key in b) {
-						if (hasOwnProperty.call(b, key) && !(size--)) break;
-					}
-					result = !size;
-				}
-			}
-			aStack.pop();
-			bStack.pop();
-			return result;
-		},
-		/* jshint ignore:end */
-
-		isEqual: function( to ) {
-			return this._eq( this._value, to, [], [] );
 		}
 	});