feat(subMenu): use subMenu instead of menu

src/main.ts

@@ -1,11 +1,13 @@
 import {
   Plugin,
   MenuItem,
+  Menu,
   TFile,
   WorkspaceLeaf,
   requireApiVersion,
   MarkdownView,
   Notice,
+  Platform,
 } from 'obsidian';
 import {
   EditorWithEditorComponent,
@@ -243,28 +245,39 @@ export default class IconizePlugin extends Plugin {
           });
         };
 
-        menu.addItem(addIconMenuItem);
-
-        const filePathData = this.getData()[file.path];
-        const hasNestedIcon =
-          typeof filePathData === 'object' &&
-          (filePathData as FolderIconObject).iconName !== null;
-        // Only add remove icon menu item when the file path exists in the data.
-        // We do not want to show this menu item for e.g. custom rules.
-        if (
-          filePathData &&
-          (typeof filePathData === 'string' || hasNestedIcon)
-        ) {
-          const icon =
-            typeof filePathData === 'string'
-              ? filePathData
-              : (filePathData as FolderIconObject).iconName;
-          if (!emoji.isEmoji(icon)) {
-            menu.addItem(changeColorOfIcon);
+        menu.addItem((item: MenuItem) => {
+          if (Platform.isDesktop) item.setTitle('Iconize').setIcon('tag')
+          else {
+            menu.addSeparator();
+            item.setIsLabel(true);
           }
+          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+          //@ts-ignore
+            const subMenu = Platform.isDesktop ? (item.setSubmenu() as Menu) : menu;
+            subMenu.addItem(addIconMenuItem);
+
+          const filePathData = this.getData()[file.path];
+          const hasNestedIcon =
+            typeof filePathData === 'object' &&
+            (filePathData as FolderIconObject).iconName !== null;
+          // Only add remove icon menu item when the file path exists in the data.
+          // We do not want to show this menu item for e.g. custom rules.
+          if (
+            filePathData &&
+            (typeof filePathData === 'string' || hasNestedIcon)
+          ) {
+            const icon =
+              typeof filePathData === 'string'
+                ? filePathData
+                : (filePathData as FolderIconObject).iconName;
+            if (!emoji.isEmoji(icon)) {
+              subMenu.addItem(changeColorOfIcon);
+            }
 
-          menu.addItem(removeIconMenuItem);
-        }
+            subMenu.addItem(removeIconMenuItem);
+          }
+          if (!Platform.isDesktop) menu.addSeparator();
+        });
       }),
     );