TF-644 Fix email content lost when attachment download failed

lib/features/email/presentation/email_view.dart

@@ -22,7 +22,7 @@ class EmailView extends GetView with NetworkConnectionMixin {
   final responsiveUtils = Get.find<ResponsiveUtils>();
   final imagePaths = Get.find<ImagePaths>();
 
-  static const int LIMIT_ADDRESS_DISPLAY = 1;
+  static const int limitAddressDisplay = 1;
 
   EmailView({Key? key}) : super(key: key);
 
@@ -182,6 +182,7 @@ class EmailView extends GetView with NetworkConnectionMixin {
                       emailController.isDisplayFullEmailAddress.value)
                   : const SizedBox.shrink()),
               _buildDivider(edgeInsets: const EdgeInsets.only(top: 8)),
+              _buildLoadingView(),
               _buildAttachments(context),
               if (kIsWeb)
                 Expanded(child: _buildEmailContent(context, constraints))
@@ -194,6 +195,29 @@ class EmailView extends GetView with NetworkConnectionMixin {
     );
   }
 
+  Widget _buildLoadingView() {
+    return Obx(() {
+      if (emailController.emailContents.isEmpty) {
+        return emailController.viewState.value.fold(
+          (failure) => const SizedBox.shrink(),
+          (success) {
+            if (success is LoadingState) {
+              return const Align(alignment: Alignment.topCenter, child: Padding(
+                  padding: EdgeInsets.all(16),
+                  child: SizedBox(
+                      width: 30,
+                      height: 30,
+                      child: CupertinoActivityIndicator(color: AppColor.colorLoading))));
+            } else {
+              return const SizedBox.shrink();
+            }
+          });
+      } else {
+        return const SizedBox.shrink();
+      }
+    });
+  }
+
   Widget _buildEmailTime(BuildContext context) {
     return Transform(
         transform: Matrix4.translationValues(0.0, 12.0, 0.0),
@@ -263,7 +287,10 @@ class EmailView extends GetView with NetworkConnectionMixin {
       PrefixEmailAddress prefixEmailAddress,
       bool isDisplayFull,
   ) {
-    final displayedEmailAddress = isDisplayFull ? listEmailAddress : listEmailAddress.sublist(0, LIMIT_ADDRESS_DISPLAY);
+    final displayedEmailAddress = isDisplayFull
+        ? listEmailAddress
+        : listEmailAddress.sublist(0, limitAddressDisplay);
+
     return Padding(
         padding: const EdgeInsets.only(top: 4),
         child: Wrap(
@@ -319,10 +346,10 @@ class EmailView extends GetView with NetworkConnectionMixin {
   }
 
   String _getRemainCountAddressReceiver(PresentationEmail email) {
-    if (email.numberOfAllEmailAddress() - LIMIT_ADDRESS_DISPLAY >= 999) {
+    if (email.numberOfAllEmailAddress() - limitAddressDisplay >= 999) {
       return '999';
     }
-    return '${email.numberOfAllEmailAddress() - LIMIT_ADDRESS_DISPLAY}';
+    return '${email.numberOfAllEmailAddress() - limitAddressDisplay}';
   }
 
   Widget _buildEmailAddressCounter(BuildContext context, PresentationEmail email) {
@@ -345,18 +372,12 @@ class EmailView extends GetView with NetworkConnectionMixin {
   }
 
   Widget _buildAttachments(BuildContext context) {
-   return Obx(() => emailController.viewState.value.fold(
+   return Obx(() {
-    (failure) => const SizedBox.shrink(),
-    (success) {
-      if (success is LoadingState) {
-        return const SizedBox.shrink();
-      } else {
      final attachments = emailController.attachments.listAttachmentsDisplayedOutSide;
      return attachments.isNotEmpty
          ? _buildAttachmentsBody(context, attachments)
          : const SizedBox.shrink();
-      }
+   });
-    }));
   }
 
   int _getAttachmentLimitDisplayed(BuildContext context) {
@@ -466,17 +487,7 @@ class EmailView extends GetView with NetworkConnectionMixin {
   }
 
   Widget _buildEmailContent(BuildContext context, BoxConstraints constraints) {
-    return Obx(() => emailController.viewState.value.fold(
+    return Obx(() {
-      (failure) => const SizedBox.shrink(),
-      (success) {
-        if (success is LoadingState) {
-          return const Align(alignment: Alignment.topCenter, child: Padding(
-              padding: EdgeInsets.all(16),
-              child: SizedBox(
-                  width: 30,
-                  height: 30,
-                  child: CupertinoActivityIndicator(color: AppColor.colorLoading))));
-        } else {
       if (emailController.emailContents.isNotEmpty) {
         final allEmailContents = emailController.emailContents.asHtmlString;
 
@@ -496,8 +507,7 @@ class EmailView extends GetView with NetworkConnectionMixin {
       } else {
         return const SizedBox.shrink();
       }
-        }
+    });
-      }));
   }
 
   List<Widget> _emailActionMoreActionTile(BuildContext context, PresentationEmail email) {