Show target user avatars for collapsed membership changes

This commit switches to displaying the target user's avatar for collapsed membership
changes which addresses the avatar issue reported in #4102.

Depends on: matrix-org/matrix-ios-kit#793

Signed-off-by: Johannes Marbach <n0-0ne+github@mailbox.org>

Riot/Modules/Room/Views/BubbleCells/RoomMembership/RoomMembershipCollapsedBubbleCell.m

@@ -70,18 +70,18 @@ - (void)render:(MXKCellData *)cellData
  // Handle user's picture by considering it is stored unencrypted on Matrix media repository
 
  // Use the Riot style placeholder
- if (!nextBubbleData.senderAvatarPlaceholder)
+ if (!nextBubbleData.targetAvatarPlaceholder)
  {
- nextBubbleData.senderAvatarPlaceholder = [AvatarGenerator generateAvatarForMatrixItem:nextBubbleData.senderId withDisplayName:nextBubbleData.senderDisplayName];
+ nextBubbleData.targetAvatarPlaceholder = [AvatarGenerator generateAvatarForMatrixItem:nextBubbleData.targetId withDisplayName:nextBubbleData.targetDisplayName];
  }
 
  avatarView.enableInMemoryCache = YES;
- [avatarView setImageURI:nextBubbleData.senderAvatarUrl
+ [avatarView setImageURI:nextBubbleData.targetAvatarUrl
  withType:nil
  andImageOrientation:UIImageOrientationUp
  toFitViewSize:avatarView.frame.size
  withMethod:MXThumbnailingMethodCrop
- previewImage:nextBubbleData.senderAvatarPlaceholder
+ previewImage:nextBubbleData.targetAvatarPlaceholder
  mediaManager:nextBubbleData.mxSession.mediaManager];
 
  // Clear the default background color of a MXKImageView instance