fix($compile): don't instantiate controllers twice for element transclude directives

This is a fix for regression introduced last week by faf5b980.

Closes #4654

src/ng/compile.js

@@ -1191,9 +1191,13 @@ function $CompileProvider($provide) {
 
             childTranscludeFn = compile($template, transcludeFn, terminalPriority,
                                         replaceDirective && replaceDirective.name, {
-                                          controllerDirectives: controllerDirectives,
+                                          // Don't pass in:
-                                          newIsolateScopeDirective: newIsolateScopeDirective,
+                                          // - controllerDirectives - otherwise we'll create duplicates controllers
-                                          templateDirective: templateDirective,
+                                          // - newIsolateScopeDirective or templateDirective - combining templates with
+                                          //   element transclusion doesn't make sense.
+                                          //
+                                          // We need only transcludeDirective so that we prevent putting transclusion
+                                          // on the same element more than once.
                                           transcludeDirective: transcludeDirective
                                         });
           } else {

test/ng/compileSpec.js

@@ -3179,6 +3179,47 @@ describe('$compile', function() {
           expect(log).toEqual('compile:elementTrans; compile:regularTrans; regular');
         });
       });
+
+
+      it('should instantiate high priority controllers only once, but low priority ones each time we transclude',
+          function() {
+        module(function() {
+          directive('elementTrans', function(log) {
+            return {
+              transclude: 'element',
+              priority: 50,
+              controller: function($transclude, $element) {
+                log('controller:elementTrans');
+                $transclude(function(clone) {
+                  $element.after(clone);
+                });
+                $transclude(function(clone) {
+                  $element.after(clone);
+                });
+                $transclude(function(clone) {
+                  $element.after(clone);
+                });
+              }
+            };
+          });
+          directive('normalDir', function(log) {
+            return {
+              controller: function() {
+                log('controller:normalDir');
+              }
+            };
+          });
+        });
+        inject(function($compile, $rootScope, log) {
+          element = $compile('<div><div element-trans normal-dir></div></div>')($rootScope);
+          expect(log).toEqual([
+            'controller:elementTrans',
+            'controller:normalDir',
+            'controller:normalDir',
+            'controller:normalDir'
+          ]);
+        });
+      });
     });