fix action delay with reactions menu (#2121)

Author: rnystrom

Classes/Issues/Comments/Reactions/IssueCommentReactionCell.swift

@@ -17,7 +17,7 @@ protocol IssueCommentReactionCellDelegate: class {
     func didTapAddReaction(cell: IssueCommentReactionCell, sender: UIView)
 }
 
-final class IssueCommentReactionCell: IssueCommentBaseCell,
+final class IssueCommentReactionCell: UICollectionViewCell,
 ListBindable,
 UICollectionViewDataSource,
 UICollectionViewDelegateFlowLayout {
@@ -89,6 +89,11 @@ UICollectionViewDelegateFlowLayout {
         fatalError("init(coder:) has not been implemented")
     }
 
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        layoutContentViewForSafeAreaInsets()
+    }
+
     // MARK: Public API
 
     func perform(operation: IssueReactionOperation, content: ReactionContent) {