[BUGFIX beta] Create a new hash parameter when creating a component cell

If we merge positional and hash parameters without duplicating the hash before,
then we get an error when rerendering.

Fixes test in #12711

(cherry picked from commit 4e7fe48)

packages/ember-htmlbars/lib/hooks/component.js

@@ -2,6 +2,8 @@ import { assert } from 'ember-metal/debug';
 import ComponentNodeManager from 'ember-htmlbars/node-managers/component-node-manager';
 import buildComponentTemplate, { buildHTMLTemplate } from 'ember-views/system/build-component-template';
 import lookupComponent from 'ember-htmlbars/utils/lookup-component';
+import assign from 'ember-metal/assign';
+import EmptyObject from 'ember-metal/empty_object';
 import Cache from 'ember-metal/cache';
 import {
   CONTAINS_DASH_CACHE,
@@ -41,9 +43,10 @@ export default function componentHook(renderNode, env, scope, _tagName, params,
        * on top of the closure component attributes.
        *
        */
-      processPositionalParamsFromCell(componentCell, params, attrs);
+      let newAttrs = assign(new EmptyObject(), attrs);
+      processPositionalParamsFromCell(componentCell, params, newAttrs);
       params = [];
-      attrs = mergeInNewHash(componentCell[COMPONENT_HASH], attrs);
+      attrs = mergeInNewHash(componentCell[COMPONENT_HASH], newAttrs);
     }
   }
 

packages/ember-htmlbars/lib/keywords/closure-component.js

@@ -7,6 +7,7 @@ import { assert } from 'ember-metal/debug';
 import isNone from 'ember-metal/is_none';
 import symbol from 'ember-metal/symbol';
 import BasicStream from 'ember-metal/streams/stream';
+import EmptyObject from 'ember-metal/empty_object';
 import { read } from 'ember-metal/streams/utils';
 import { labelForSubexpr } from 'ember-htmlbars/hooks/subexpr';
 import assign from 'ember-metal/assign';
@@ -54,12 +55,14 @@ function createClosureComponentCell(env, originalComponentPath, params, hash, la
   assert(`Component path cannot be null in ${label}`,
          !isNone(componentPath));
 
+  let newHash = assign(new EmptyObject(), hash);
+
   if (isComponentCell(componentPath)) {
-    return createNestedClosureComponentCell(componentPath, params, hash);
+    return createNestedClosureComponentCell(componentPath, params, newHash);
   } else {
     assert(`The component helper cannot be used without a valid component name. You used "${componentPath}" via ${label}`,
           isValidComponentPath(env, componentPath));
-    return createNewClosureComponentCell(env, componentPath, params, hash);
+    return createNewClosureComponentCell(env, componentPath, params, newHash);
   }
 }