[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

@@ -137,9 +137,14 @@ export class PluginViewRegistry implements FrontendApplicationContribution {
             iconClass: 'theia-plugin-test-tab-icon',
             closeable: true
         });
-        this.contextKeyService.onDidChange(e => {
+        this.contextKeyService.onDidChange(async e => {
             for (const [, view] of this.views.values()) {
                 const clauseContext = this.viewClauseContexts.get(view.id);
+                const pluginView = await this.getView(view.id);
+                // does not update the view visibility if the view is hidden explicitly.
+                if (pluginView && pluginView.isHidden) {
+                    return;
+                }
                 if (clauseContext && e.affects(clauseContext)) {
                     this.updateViewVisibility(view.id);
                 }