Improve handling of incomplete and failed attachment downloads.

// FREEBIE

Signal/src/Models/TSMessageAdapaters/TSMessageAdapter.m

@@ -155,12 +155,16 @@
                     TSAttachmentPointer *pointer = (TSAttachmentPointer *)attachment;
                     adapter.messageType          = TSInfoMessageAdapter;
 
-                    if (pointer.isDownloading) {
-                        adapter.messageBody = NSLocalizedString(@"ATTACHMENT_DOWNLOADING", nil);
-                    } else if (pointer.hasFailed) {
-                        adapter.messageBody = NSLocalizedString(@"ATTACHMENT_DOWNLOAD_FAILED", nil);
-                    } else {
-                        adapter.messageBody = NSLocalizedString(@"ATTACHMENT_QUEUED", nil);
+                    switch (pointer.state) {
+                        case TSAttachmentPointerStateEnqueued:
+                            adapter.messageBody = NSLocalizedString(@"ATTACHMENT_QUEUED", nil);
+                            break;
+                        case TSAttachmentPointerStateDownloading:
+                            adapter.messageBody = NSLocalizedString(@"ATTACHMENT_DOWNLOADING", nil);
+                            break;
+                        case TSAttachmentPointerStateFailed:
+                            adapter.messageBody = NSLocalizedString(@"ATTACHMENT_DOWNLOAD_FAILED", nil);
+                            break;
                     }
                 } else {
                     DDLogError(@"We retrieved an attachment that doesn't have a known type : %@",

Signal/src/view controllers/MessagesViewController.m

@@ -1586,7 +1586,7 @@ typedef enum : NSUInteger {
 
                 // FIXME possible for pointer to get stuck in isDownloading state if app is closed while downloading.
                 // see: https://github.com/WhisperSystems/Signal-iOS/issues/1254
-                if (!pointer.isDownloading) {
+                if (pointer.state != TSAttachmentPointerStateDownloading) {
                     OWSAttachmentsProcessor *processor =
                         [[OWSAttachmentsProcessor alloc] initWithAttachmentPointer:pointer
                                                                     networkManager:self.networkManager];