Apply MatrixKit PR changes

Riot/Modules/MatrixKit/Models/Room/MXKRoomBubbleComponent.h

@@ -19,6 +19,8 @@
 #import "MXKEventFormatter.h"
 #import "MXKURLPreviewDataProtocol.h"
 
+@class MXThread;
+
 /**
  Flags to indicate if a fix is required at the display time.
  */
@@ -103,6 +105,11 @@ typedef enum : NSUInteger {
  */
 @property (nonatomic, readonly) BOOL showEncryptionBadge;
 
+/**
+ Thread for the bubble component. Should only exist for thread root events.
+ */
+@property (nonatomic, readonly) MXThread *thread;
+
 /**
  Create a new `MXKRoomBubbleComponent` object based on a `MXEvent` instance.