Delay footer collapse in new messages.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -235,6 +235,7 @@ typedef enum : NSUInteger {
 @property (nonatomic) ContactShareViewHelper *contactShareViewHelper;
 @property (nonatomic) NSTimer *reloadTimer;
 @property (nonatomic, nullable) NSDate *lastReloadDate;
+@property (nonatomic, nullable) NSDate *collapseCutoffDate;
 
 @end
 
@@ -447,6 +448,7 @@ typedef enum : NSUInteger {
     // Cache the cell media for ~24 cells.
     self.cellMediaCache.countLimit = 24;
     _conversationStyle = [[ConversationStyle alloc] initWithThread:thread];
+    self.collapseCutoffDate = [NSDate new];
 
     // We need to update the "unread indicator" _before_ we determine the initial range
     // size, since it depends on where the unread indicator is placed.
@@ -818,9 +820,11 @@ typedef enum : NSUInteger {
 - (void)resetContentAndLayout
 {
     // Avoid layout corrupt issues and out-of-date message subtitles.
+    self.lastReloadDate = [NSDate new];
+    self.collapseCutoffDate = [NSDate new];
+    [self reloadViewItems];
     [self.collectionView.collectionViewLayout invalidateLayout];
     [self.collectionView reloadData];
-    self.lastReloadDate = [NSDate new];
 }
 
 - (void)setUserHasScrolled:(BOOL)userHasScrolled
@@ -3384,9 +3388,10 @@ typedef enum : NSUInteger {
         // These errors seems to be very rare; they can only be reproduced
         // using the more extreme actions in the debug UI.
         OWSProdLogAndFail(@"%@ hasMalformedRowChange", self.logTag);
+        self.lastReloadDate = [NSDate new];
+        self.collapseCutoffDate = [NSDate new];
         [self reloadViewItems];
         [self.collectionView reloadData];
-        self.lastReloadDate = [NSDate new];
         [self updateLastVisibleTimestamp];
         return;
     }
@@ -4349,9 +4354,11 @@ typedef enum : NSUInteger {
 - (void)conversationColorWasUpdated
 {
     [self.conversationStyle updateProperties];
+    self.collapseCutoffDate = [NSDate new];
+    self.lastReloadDate = [NSDate new];
+    [self reloadViewItems];
     [self.headerView updateAvatar];
     [self.collectionView reloadData];
-    self.lastReloadDate = [NSDate new];
 }
 
 - (void)groupWasUpdated:(TSGroupModel *)groupModel
@@ -4862,6 +4869,8 @@ typedef enum : NSUInteger {
     BOOL shouldShowDateOnNextViewItem = YES;
     uint64_t previousViewItemTimestamp = 0;
     OWSUnreadIndicator *_Nullable unreadIndicator = self.dynamicInteractions.unreadIndicator;
+    uint64_t collapseCutoffTimestamp = [NSDate ows_millisecondsSince1970ForDate:self.collapseCutoffDate];
+
     BOOL hasPlacedUnreadIndicator = NO;
     for (ConversationViewItem *viewItem in viewItems) {
         BOOL canShowDate = NO;
@@ -5071,6 +5080,10 @@ typedef enum : NSUInteger {
             }
         }
 
+        if (viewItem.interaction.timestampForSorting > collapseCutoffTimestamp) {
+            shouldHideFooter = NO;
+        }
+
         viewItem.isFirstInCluster = isFirstInCluster;
         viewItem.isLastInCluster = isLastInCluster;
         viewItem.shouldShowSenderAvatar = shouldShowSenderAvatar;