Change image resizing/quality behavior, preferring smaller images in the common case.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2664,7 +2664,7 @@ typedef NS_ENUM(NSInteger, MessagesRangeSizeMode) {
                            SignalAttachment *attachment =
                                [SignalAttachment attachmentWithDataSource:dataSource
                                                                   dataUTI:dataUTI
-                                                        attachmentQuality:TSAttachmentQualityCompact];
+                                                        attachmentQuality:TSAttachmentQualityMedium];
                            [self dismissViewControllerAnimated:YES
                                                     completion:^{
                                                         OWSAssert([NSThread isMainThread]);

SignalMessaging/attachments/SignalAttachment.swift

@@ -66,14 +66,17 @@ public enum TSImageQuality: UInt {
 @objc
 public enum TSAttachmentQuality: UInt {
     case original
+    case medium
     case compact
 
     func imageQuality() -> TSImageQuality {
         switch self {
         case .original:
             return .original
-        case .compact:
+        case .medium:
             return .mediumHigh
+        case .compact:
+            return .medium
         }
     }
 }