MOBILE-3585 mainmenu: Fix go to root when tab clicked

src/app/addon/privatefiles/services/handlers/mainmenu.ts

@@ -45,6 +45,7 @@ export class AddonPrivateFilesMainMenuHandler implements CoreMainMenuHandler {
             icon: 'fa-folder',
             title: 'addon.privatefiles.files',
             page: 'addon-privatefiles',
+            subPage: 'root',
             class: 'addon-privatefiles-handler',
         };
     }

src/app/core/mainmenu/pages/menu/menu.page.ts

@@ -19,6 +19,7 @@ import { Subscription } from 'rxjs';
 
 import { CoreApp } from '@services/app';
 import { CoreSites } from '@services/sites';
+import { CoreTextUtils } from '@services/utils/text';
 import { CoreEvents, CoreEventObserver, CoreEventLoadPageMainMenuData } from '@singletons/events';
 import { CoreMainMenu } from '../../services/mainmenu';
 import { CoreMainMenuDelegate, CoreMainMenuHandlerToDisplay } from '../../services/mainmenu.delegate';
@@ -242,8 +243,10 @@ export class CoreMainMenuPage implements OnInit, OnDestroy {
             return;
         }
 
+        const trimmedUrl = CoreTextUtils.instance.trimCharacter(this.router.url, '/');
+
         // Current tab was clicked. Check if user is already at root level.
-        if (this.router.url == '/mainmenu/' + page) {
+        if (trimmedUrl  == CoreTextUtils.instance.trimCharacter(page, '/')) {
             // Already at root level, nothing to do.
             return;
         }
@@ -255,8 +258,17 @@ export class CoreMainMenuPage implements OnInit, OnDestroy {
         try {
             const tab = this.tabs.find((tab) => tab.page == page);
 
+            // Use tab's subPage to check if user is already at root level.
+            if (tab?.subPage && trimmedUrl ==
+                CoreTextUtils.instance.trimCharacter(CoreTextUtils.instance.concatenatePaths(tab.page, tab.subPage), '/')) {
+                // Already at root level, nothing to do.
+                return;
+            }
+
             if (tab?.title) {
-                await CoreDomUtils.instance.showConfirm(Translate.instance.instant('core.confirmgotabroot', { name: tab.title }));
+                await CoreDomUtils.instance.showConfirm(Translate.instance.instant('core.confirmgotabroot', {
+                    name: Translate.instance.instant(tab.title),
+                }));
             } else {
                 await CoreDomUtils.instance.showConfirm(Translate.instance.instant('core.confirmgotabrootdefault'));
             }

src/app/core/mainmenu/services/handlers/mainmenu.ts

@@ -55,6 +55,7 @@ export class CoreHomeMainMenuHandler implements CoreMainMenuHandler {
             icon: 'fa-home',
             title: 'core.mainmenu.home',
             page: 'home',
+            // @todo: subPage? The page can change due to core-tabs.
             class: 'core-home-handler',
         };
     }

src/app/core/mainmenu/services/mainmenu.delegate.ts

@@ -32,6 +32,13 @@ export interface CoreMainMenuHandlerData {
      */
     page: string;
 
+    /**
+     * Sub page loaded when the handler page is loaded.
+     * If your module performs a redirect when it's opened you need to specify the sub page in here.
+     * E.g. if page is 'foo' but it redirects to 'foo/bar' when opened, this value must be 'bar'.
+     */
+    subPage?: string;
+
     /**
      * Title to display for the handler.
      */

src/app/services/utils/text.ts

@@ -891,6 +891,20 @@ export class CoreTextUtilsProvider {
         });
     }
 
+    /**
+     * Remove all ocurrences of a certain character from the start and end of a string.
+     *
+     * @param text Text to treat.
+     * @param character Character to remove.
+     * @return Treated text.
+     */
+    trimCharacter(text: string, character: string): string {
+        const escaped = this.escapeForRegex(character);
+        const regExp = new RegExp(`^${escaped}+|${escaped}+$`, 'g');
+
+        return text.replace(regExp, '');
+    }
+
     /**
      * If a number has only 1 digit, add a leading zero to it.
      *