Add additional height in the cell for thread summary view

Riot/Modules/Room/CellData/RoomBubbleCellData.m

@@ -263,6 +263,17 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
     return [super hasNoDisplay];
 }
 
+- (BOOL)hasThreadRoot
+{
+    if (!RiotSettings.shared.enableThreads)
+    {
+        //  do not consider this cell data if threads not enabled in the timeline
+        return NO;
+    }
+    
+    return super.hasThreadRoot;
+}
+
 #pragma mark - Bubble collapsing
 
 - (BOOL)collapseWith:(id<MXKRoomBubbleCellDataStoring>)cellData
@@ -531,6 +542,8 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
     additionalVerticalHeight+= [self urlPreviewHeightForEventId:eventId];
     // Add vertical whitespace in case of reactions.
     additionalVerticalHeight+= [self reactionHeightForEventId:eventId];
+    // Add vertical whitespace in case of a thread root
+    additionalVerticalHeight+= [self threadSummaryViewHeightForEventId:eventId];
     // Add vertical whitespace in case of read receipts.
     additionalVerticalHeight+= [self readReceiptHeightForEventId:eventId];
     
@@ -550,6 +563,7 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
         
         height+= [self urlPreviewHeightForEventId:eventId];
         height+= [self reactionHeightForEventId:eventId];
+        height+= [self threadSummaryViewHeightForEventId:eventId];
         height+= [self readReceiptHeightForEventId:eventId];
     }
     
@@ -588,6 +602,33 @@ NSString *const URLPreviewDidUpdateNotification = @"URLPreviewDidUpdateNotificat
     self.shouldUpdateAdditionalContentHeight = YES;
 }
 
+- (CGFloat)threadSummaryViewHeightForEventId:(NSString*)eventId
+{
+    if (!RiotSettings.shared.enableThreads)
+    {
+        //  do not show thread summary view if threads not enabled in the timeline
+        return 0;
+    }
+    if (roomDataSource.threadId)
+    {
+        //  do not show thread summary view on threads
+        return 0;
+    }
+    NSInteger index = [self bubbleComponentIndexForEventId:eventId];
+    if (index == NSNotFound)
+    {
+        return 0;
+    }
+    MXKRoomBubbleComponent *component = self.bubbleComponents[index];
+    if (!component.thread)
+    {
+        //  component is not a thread root
+        return 0;
+    }
+    //  TODO: Fix hardcoded height
+    return RoomBubbleCellLayout.threadSummaryViewTopMargin + 30;
+}
+
 - (CGFloat)urlPreviewHeightForEventId:(NSString*)eventId
 {
     MXKRoomBubbleComponent *component = [self bubbleComponentWithLinkForEventId:eventId];