TF-874 Fix duplicate focusable when focus to editor composer on mobile

lib/features/composer/presentation/composer_controller.dart

@@ -316,6 +316,22 @@ class ComposerController extends BaseController {
     subjectEmailInputFocusNode = FocusNode();
   }
 
+  void initRichTextForMobile(BuildContext context, HtmlEditorApi editorApi) {
+    richTextMobileTabletController.htmlEditorApi = editorApi;
+    keyboardRichTextController.onCreateHTMLEditor(
+      editorApi,
+      onEnterKeyDown: _onEnterKeyDown,
+      context: context,
+    );
+
+    richTextMobileTabletController.htmlEditorApi?.onFocus = () {
+      FocusManager.instance.primaryFocus?.unfocus();
+
+      _collapseAllRecipient();
+      _autoCreateEmailTag();
+    };
+  }
+
   void _initEmail() {
     final arguments = kIsWeb ? mailboxDashBoardController.routerArguments : Get.arguments;
     if (arguments is ComposerArguments) {
@@ -1483,7 +1499,7 @@ class ComposerController extends BaseController {
     popBack();
   }
 
-  void onEnterKeyDown() {
+  void _onEnterKeyDown() {
     if(scrollController.position.pixels < scrollController.position.maxScrollExtent) {
       scrollController.animateTo(
         scrollController.position.pixels + 20,

lib/features/composer/presentation/composer_view.dart

@@ -599,7 +599,6 @@ class ComposerView extends GetWidget<ComposerController>
   }
 
   Widget _buildHtmlEditor(BuildContext context, {String? initialContent}) {
-    final richTextMobileTabletController = controller.richTextMobileTabletController;
     return Padding(
       padding: const EdgeInsets.only(left: 16, right: 16, bottom: 20),
       child: HtmlEditor(
@@ -607,14 +606,7 @@ class ComposerView extends GetWidget<ComposerController>
         minHeight: 550,
         addDefaultSelectionMenuItems: false,
         initialContent: initialContent ?? '',
-        onCreated: (editorApi) {
-          richTextMobileTabletController.htmlEditorApi = editorApi;
-            controller.keyboardRichTextController.onCreateHTMLEditor(
-              editorApi,
-              onEnterKeyDown: controller.onEnterKeyDown,
-              context: context,
-            );
-        },
+        onCreated: (editorApi) => controller.initRichTextForMobile(context, editorApi)
       ),
     );
   }