node locking enhancements and fixes (#955)

* optimize image resolver

* allow previewing locked files

* allow selecting locked nodes

* fix comments and metadata tabs

* improved lock checks

* remove obsolete "experimental" directive

src/app/components/recent-files/recent-files.component.spec.ts

@@ -38,7 +38,6 @@ import { ContentManagementService } from '../../services/content-management.serv
 
 import { RecentFilesComponent } from './recent-files.component';
 import { AppTestingModule } from '../../testing/app-testing.module';
-import { ExperimentalDirective } from '../../directives/experimental.directive';
 
 describe('RecentFilesComponent', () => {
   let fixture: ComponentFixture<RecentFilesComponent>;
@@ -66,8 +65,7 @@ describe('RecentFilesComponent', () => {
         NodeFavoriteDirective,
         DocumentListComponent,
         RecentFilesComponent,
-        AppConfigPipe,
-        ExperimentalDirective
+        AppConfigPipe
       ],
       schemas: [NO_ERRORS_SCHEMA]
     });

src/app/components/recent-files/recent-files.component.ts

@@ -79,11 +79,6 @@ export class RecentFilesComponent extends PageComponent implements OnInit {
 
   onNodeDoubleClick(node: MinimalNodeEntity) {
     if (node && node.entry) {
-      if (PageComponent.isLockedNode(node.entry)) {
-        event.preventDefault();
-        return;
-      }
-
       this.showPreview(node);
     }
   }