TF-2092 Persist selected signature while expanding and minimizing the editor

(cherry picked from commit 6c2830d99b5cb0fd87ff530b3ec57cd2cdf1ff73)

lib/features/composer/presentation/composer_controller.dart

@@ -376,8 +376,10 @@ class ComposerController extends BaseController {
         _onChangeCursorOnMobile(coordinates, context);
       },
     );
+    if (identitySelected.value == null) {
       _getAllIdentities();
     }
+  }
 
   void _initEmail() {
     final arguments = PlatformInfo.isWeb
@@ -1196,11 +1198,6 @@ class ComposerController extends BaseController {
     _updateTextForEditor();
     screenDisplayMode.value = displayMode;
     _autoFocusFieldWhenLauncher();
-
-    Future.delayed(
-      const Duration(milliseconds: 500),
-      () => selectIdentity(identitySelected.value)
-    );
   }
 
   void _updateTextForEditor() async {
@@ -1645,8 +1642,10 @@ class ComposerController extends BaseController {
     richTextWebController.editorController.setFullScreen();
     onChangeTextEditorWeb(initContent);
     richTextWebController.setEnableCodeView();
+    if (identitySelected.value == null) {
       _getAllIdentities();
     }
+  }
 
   void handleOnFocusHtmlEditorWeb() {
     FocusManager.instance.primaryFocus?.unfocus();