fix($compile): do not overwrite values set in $onInit() for <-bound literals

See angular#15118 for more details.

Fixes angular#15118

Closes angular#15123

Author: gkalpak

src/ng/compile.js

@@ -3487,18 +3487,21 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
             if (optional && !attrs[attrName]) break;
 
             parentGet = $parse(attrs[attrName]);
+            var deepWatch = parentGet.literal;
 
             var initialValue = destination[scopeName] = parentGet(scope);
             initialChanges[scopeName] = new SimpleChange(_UNINITIALIZED_VALUE, destination[scopeName]);
 
             removeWatch = scope.$watch(parentGet, function parentValueWatchAction(newValue, oldValue) {
               if (oldValue === newValue) {
-                if (oldValue === initialValue) return;
+                if (oldValue === initialValue || (deepWatch && equals(oldValue, initialValue))) {
+                  return;
+                }
                 oldValue = initialValue;
               }
               recordChanges(scopeName, newValue, oldValue);
               destination[scopeName] = newValue;
-            }, parentGet.literal);
+            }, deepWatch);
 
             removeWatchCollection.push(removeWatch);
             break;

test/ng/compileSpec.js

@@ -5476,7 +5476,7 @@ describe('$compile', function() {
                 expect($rootScope.name).toEqual('outer');
                 expect(component.input).toEqual('$onInit');
 
-                $rootScope.$apply();
+                $rootScope.$digest();
 
                 expect($rootScope.name).toEqual('outer');
                 expect(component.input).toEqual('$onInit');
@@ -5489,6 +5489,37 @@ describe('$compile', function() {
               });
             });
 
+            it('should not update isolate again after $onInit if outer is a literal', function() {
+              module('owComponentTest');
+              inject(function() {
+                $rootScope.name = 'outer';
+                compile('<ow-component input="[name]"></ow-component>');
+
+                expect(component.input).toEqual('$onInit');
+
+                // No outer change
+                $rootScope.$apply('name = "outer"');
+                expect(component.input).toEqual('$onInit');
+
+                // Outer change
+                $rootScope.$apply('name = "re-outer"');
+                expect(component.input).toEqual(['re-outer']);
+
+                expect(log).toEqual([
+                  'constructor',
+                  [
+                    '$onChanges',
+                    jasmine.objectContaining({currentValue: ['outer']})
+                  ],
+                  '$onInit',
+                  [
+                    '$onChanges',
+                    jasmine.objectContaining({previousValue: ['outer'], currentValue: ['re-outer']})
+                  ]
+                ]);
+              });
+            });
+
             it('should update isolate again after $onInit if outer has changed (before initial watchAction call)', function() {
               module('owComponentTest');
               inject(function() {