Support PlatformDataKeys.SELECTED_ITEMS in project view

reference:
OC-16334 Rework AppCode project view actions to work correctly with standard project and scope views

platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectViewImpl.java

@@ -1157,6 +1157,11 @@ public class ProjectViewImpl extends ProjectView implements PersistentStateCompo
         return selectedElements.isEmpty() ? null : selectedElements.toArray(new NamedLibraryElement[selectedElements.size()]);
       }
 
+      if (PlatformDataKeys.SELECTED_ITEMS.is(dataId)) {
+        final AbstractProjectViewPane viewPane = getCurrentProjectViewPane();
+        return viewPane == null ?  null : viewPane.getSelectedElements();
+      }
+
       if (QuickActionProvider.KEY.is(dataId)) {
         return ProjectViewImpl.this;
       }