Update Show In MRU when triggered from Open Resource dialog

Using Show In from the Open Resource dialog, either via the dropdown or
the implicit action on a non-file selection, opened the target view but
never updated the most-recently-used order. Both paths call showView and
IShowInTarget.show directly instead of the Navigate > Show In command, so
WorkbenchPage.performedShowIn was never invoked and the MRU list stayed
unchanged.

Promote the used target via performedShowIn after a successful show, so
the Open Resource dialog feeds the same MRU as the regular Show In.

Fixes #4058

Author: vogella

bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/OpenResourceDialog.java

@@ -126,7 +126,11 @@ public void run() {
 					try {
 						view = page.showView(targetId);
 						IShowInTarget target = getShowInTarget(view);
-						if (!(target != null && target.show(getContext(null)))) {
+						if (target != null && target.show(getContext(null))) {
+							if (page instanceof WorkbenchPage workbenchPage) {
+								workbenchPage.performedShowIn(targetId);
+							}
+						} else {
 							page.getWorkbenchWindow().getShell().getDisplay().beep();
 						}
 					} catch (PartInitException e) {
@@ -353,6 +357,8 @@ private boolean showSelectionInFirstShowInTarget(IStructuredSelection selection)
 			IShowInTarget target = Adapters.adapt(view, IShowInTarget.class);
 			if (target == null || !target.show(new ShowInContext(null, selection))) {
 				activePage.getWorkbenchWindow().getShell().getDisplay().beep();
+			} else {
+				workbenchPage.performedShowIn(descriptor.getId());
 			}
 		} catch (PartInitException e) {
 			StatusManager.getManager().handle(new Status(IStatus.ERROR, IDEWorkbenchPlugin.IDE_WORKBENCH,