refactor(client): use different hiding mechanism for quick search

src/public/app/widgets/containers/launcher.js

@@ -61,12 +61,7 @@ export default class LauncherWidget extends BasicWidget {
         }
 
         if (!this.innerWidget) {
-            if (launcherType === "builtinWidget") {
+            throw new Error(`Unknown initialization error for note '${note.noteId}', title '${note.title}'`);
-                // This allows filtering of builtin widgets based on the layout (horizontal / vertical)
-                return false;
-            } else {
-                throw new Error(`Unknown initialization error for note '${note.noteId}', title '${note.title}'`);
-            }
         }
 
         this.child(this.innerWidget);
@@ -118,7 +113,7 @@ export default class LauncherWidget extends BasicWidget {
             case "todayInJournal":
                 return new TodayLauncher(note);
             case "quickSearch":
-                return this.isHorizontalLayout ? new QuickSearchLauncherWidget() : null;
+                return new QuickSearchLauncherWidget(this.isHorizontalLayout);
             default:
                 throw new Error(`Unrecognized builtin widget ${builtinWidget} for launcher ${note.noteId} "${note.title}"`);
         }

src/public/app/widgets/quick_search_launcher.js

@@ -11,8 +11,19 @@ import QuickSearchWidget from "./quick_search.js";
  */
 export default class QuickSearchLauncherWidget extends QuickSearchWidget {
 
+    constructor(isHorizontalLayout) {
+        super();
+        this.isHorizontalLayout = isHorizontalLayout;
+    }
+
     isEnabled() {
+        if (!this.isHorizontalLayout) {
+            // The quick search widget is added somewhere else on the vertical layout.
+            return false;
+        }
+
         if (utils.isMobile()) {
+            // The widget takes too much spaces to be included in the mobile layout.
             return false;
         }