[UI-Kit] Pop attachment download dialog in case of any error.

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_flutter/lib/src/attachment_actions_modal.dart

@@ -109,7 +109,9 @@ class AttachmentActionsModal extends StatelessWidget {
                             received,
                           );
                         },
-                      );
+                      ).catchError((_) {
+                        progressNotifier.value = null;
+                      });
 
                       // Closing attachment actions modal before opening
                       // attachment download dialog
@@ -212,9 +214,8 @@ class AttachmentActionsModal extends StatelessWidget {
       child: ValueListenableBuilder(
         valueListenable: progressNotifier,
         builder: (_, _DownloadProgress progress, __) {
-          final value = progress.toProgressIndicatorValue;
+          // Pop the dialog in case the progress is null or it's completed.
-          final downloadComplete = value == 1.0;
+          if (progress == null || progress?.toProgressIndicatorValue == 1.0) {
-          if (value == 1.0) {
             Future.delayed(
               const Duration(milliseconds: 500),
               Navigator.of(context).pop,
@@ -231,7 +232,15 @@ class AttachmentActionsModal extends StatelessWidget {
                   color: theme.colorTheme.white,
                 ),
                 child: Center(
-                  child: downloadComplete
+                  child: progress == null
+                      ? Container(
+                          height: 100,
+                          width: 100,
+                          child: StreamSvgIcon.error(
+                            color: theme.colorTheme.greyGainsboro,
+                          ),
+                        )
+                      : progress.toProgressIndicatorValue == 1.0
                           ? Container(
                               height: 160,
                               width: 160,
@@ -246,7 +255,7 @@ class AttachmentActionsModal extends StatelessWidget {
                                 fit: StackFit.expand,
                                 children: [
                                   CircularProgressIndicator(
-                                value: value,
+                                    value: progress.toProgressIndicatorValue,
                                     strokeWidth: 8.0,
                                     valueColor: AlwaysStoppedAnimation(
                                       theme.colorTheme.accentBlue,