clean up some animations

// FREEBIE

Signal/src/ViewControllers/ContactsViewHelper.m

@@ -328,6 +328,10 @@ NS_ASSUME_NONNULL_BEGIN
                 // Not actually a "new" contact, but this brings up the edit form rather than the "Read" form
                 // saving our users a tap in some cases when we already know they want to edit.
                 contactViewController = [CNContactViewController viewControllerForNewContact:cnContact];
+
+                // Default title is "New Contact". We could give a more descriptive title, but anything
+                // seems redundant - the context is sufficiently clear.
+                contactViewController.title = @"";
             } else {
                 contactViewController = [CNContactViewController viewControllerForContact:cnContact];
             }

Signal/src/ViewControllers/OWSConversationSettingsTableViewController.m

@@ -155,7 +155,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)didFinishEditingContact
 {
     DDLogDebug(@"%@ %s", self.tag, __PRETTY_FUNCTION__);
-    [self dismissViewControllerAnimated:YES completion:nil];
+    [self dismissViewControllerAnimated:NO completion:nil];
 }
 
 #pragma mark - CNContactViewControllerDelegate
@@ -163,8 +163,16 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)contactViewController:(CNContactViewController *)viewController
        didCompleteWithContact:(nullable CNContact *)contact
 {
-    DDLogDebug(@"%@ done editing contact.", self.tag);
-    [self dismissViewControllerAnimated:YES completion:nil];
+    if (contact) {
+        // Saving normally returns you to the "Show Contact" view
+        // which we're not interested in, so we skip it here. There is
+        // an unfortunate blip of the "Show Contact" view on slower devices.
+        DDLogDebug(@"%@ completed editing contact.", self.tag);
+        [self dismissViewControllerAnimated:NO completion:nil];
+    } else {
+        DDLogDebug(@"%@ canceled editing contact.", self.tag);
+        [self dismissViewControllerAnimated:YES completion:nil];
+    }
 }
 
 #pragma mark - ContactsViewHelperDelegate