Fix mention pills display when coming back to a room with an unsent message

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

@@ -160,11 +160,6 @@ extern NSString *const kMXKRoomDataSourceTimelineErrorErrorKey;
  */
 @property (nonatomic, readonly) NSInteger serverSyncEventCount;
 
-/**
- The current text message partially typed in text input (use nil to reset it).
- */
-@property (nonatomic) NSString *partialTextMessage;
-
 /**
  The current attributed text message partially typed in text input (use nil to reset it).
  */

Riot/Modules/MatrixKit/Models/Room/MXKRoomDataSource.m

@@ -919,16 +919,6 @@ typedef NS_ENUM (NSUInteger, MXKRoomDataSourceError) {
     return attachments;
 }
 
-- (NSString *)partialTextMessage
-{
-    return _room.partialTextMessage;
-}
-
-- (void)setPartialTextMessage:(NSString *)partialTextMessage
-{
-    _room.partialTextMessage = partialTextMessage;
-}
-
 - (NSAttributedString *)partialAttributedTextMessage
 {
     return _room.partialAttributedTextMessage;