fix(Angular): allow unescaped = signs in values in parseKeyValue

In some cases people will not follow all URL standards and may have
unescaped = characters in their GET parameter values. Currently $location
will not parse them correctly dropping everything after the unescaped =.

This change includes all characters after the first `=` up to the next `&`.

Closes #12351

src/Angular.js

@@ -1250,13 +1250,19 @@ function tryDecodeURIComponent(value) {
  * @returns {Object.<string,boolean|Array>}
  */
 function parseKeyValue(/**string*/keyValue) {
-  var obj = {}, key_value, key;
+  var obj = {};
   forEach((keyValue || "").split('&'), function(keyValue) {
+    var splitPoint, key, val;
     if (keyValue) {
-      key_value = keyValue.replace(/\+/g,'%20').split('=');
-      key = tryDecodeURIComponent(key_value[0]);
+      key = keyValue = keyValue.replace(/\+/g,'%20');
+      splitPoint = keyValue.indexOf('=');
+      if (splitPoint !== -1) {
+        key = keyValue.substring(0, splitPoint);
+        val = keyValue.substring(splitPoint + 1);
+      }
+      key = tryDecodeURIComponent(key);
       if (isDefined(key)) {
-        var val = isDefined(key_value[1]) ? tryDecodeURIComponent(key_value[1]) : true;
+        val = isDefined(val) ? tryDecodeURIComponent(val) : true;
         if (!hasOwnProperty.call(obj, key)) {
           obj[key] = val;
         } else if (isArray(obj[key])) {

test/AngularSpec.js

@@ -994,6 +994,12 @@ describe('angular', function() {
         'toString': '123'
       });
     });
+
+    it('should ignore badly escaped = characters', function() {
+      expect(parseKeyValue('test=a=b')).toEqual({
+          'test': 'a=b'
+      });
+    });
   });
 
   describe('toKeyValue', function() {