enable clear action when there is a value in the beginning

src/vs/workbench/contrib/extensions/electron-browser/extensionsActions.ts

@@ -1500,10 +1500,11 @@ export class ClearExtensionsInputAction extends Action {
 		id: string,
 		label: string,
 		onSearchChange: Event<string>,
+		value: string,
 		@IViewletService private readonly viewletService: IViewletService
 	) {
 		super(id, label, 'clear-extensions', true);
-		this.enabled = false;
+		this.onSearchChange(value);
 		onSearchChange(this.onSearchChange, this, this.disposables);
 	}
 

src/vs/workbench/contrib/extensions/electron-browser/extensionsViewlet.ts

@@ -400,7 +400,7 @@ export class ExtensionsViewlet extends ViewContainerViewlet implements IExtensio
 	getActions(): IAction[] {
 		if (!this.primaryActions) {
 			this.primaryActions = [
-				this.instantiationService.createInstance(ClearExtensionsInputAction, ClearExtensionsInputAction.ID, ClearExtensionsInputAction.LABEL, this.onSearchChange)
+				this.instantiationService.createInstance(ClearExtensionsInputAction, ClearExtensionsInputAction.ID, ClearExtensionsInputAction.LABEL, this.onSearchChange, this.searchBox.getValue())
 			];
 		}
 		return this.primaryActions;