[Tree-view] Hide tree-view on reload

Fixes: eclipse-theia#7037

Respects hide and collapse for tree-views such as `NPM Scripts` on
reload.

Co-authored-by: Anas Shahid <muhammad.shahid@ericsson.com>
Co-authored-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

Signed-off-by: Anas Shahid <muhammad.shahid@ericsson.com>

packages/plugin-ext/src/main/browser/view/plugin-view-registry.ts

@@ -155,6 +155,10 @@ export class PluginViewRegistry implements FrontendApplicationContribution {
             }
             return;
         }
+        // does not update the view visibility if the view is not visible or hidden explicitly.
+        if (!this.isViewVisible(viewId) || widget.isHidden) {
+            return;
+        }
         const viewInfo = this.views.get(viewId);
         if (!viewInfo) {
             return;