[Views] Track by domain object id

Track by domain object id to prevent dom thrashing when selecting different
tree nodes.

platform/commonUI/general/res/templates/subtree.html

@@ -26,7 +26,7 @@
             <span class="title-label">Loading...</span>
         </span>
     </li>
-    <li ng-repeat="child in composition">
+    <li ng-repeat="child in composition track by child.getId()">
         <mct-representation key="'tree-node'"
                             mct-object="child"
                             parameters="parameters"

platform/search/res/templates/search.html

@@ -48,7 +48,7 @@
     <div class="search-results flex-elem holder grows vscroll"
          ng-class="{ off: !(loading || results.length > 0), loading: loading }">
         <mct-representation key="'search-item'"
-                            ng-repeat="result in results"
+                            ng-repeat="result in results track by result.object.getId()"
                             mct-object="result.object"
                             ng-model="ngModel"
                             class="l-flex-row flex-elem grows">