ui: add to do for expand button

Session/Conversations/Message Cells/Content Views/ReactionContainerView.swift

@@ -11,6 +11,7 @@ final class ReactionContainerView : UIView {
     private var showingAllReactions = false
     
     var reactionViews: [ReactionView] = []
+    var expandButton: ExpandingReactionButton?
     
     // MARK: Lifecycle
     init() {
@@ -56,8 +57,10 @@ final class ReactionContainerView : UIView {
             reactionViews.append(reactionView)
         }
         if expandButtonReactions.count > 0 {
-            let expandButton = ExpandingReactionButton(emojis: expandButtonReactions)
+            expandButton = ExpandingReactionButton(emojis: expandButtonReactions)
             stackView.addArrangedSubview(expandButton)
+        } else {
+            expandButton = nil
         }
         containerView.addArrangedSubview(stackView)
     }

Session/Conversations/Message Cells/VisibleMessageCell.swift

@@ -557,9 +557,12 @@ final class VisibleMessageCell : MessageCell, LinkPreviewViewDelegate {
                     } else {
                         delegate?.quickReact(viewItem, with: reactionView.emoji)
                     }
-                    break
+                    return
                 }
             }
+            if let expandButton = reactionContainerView.expandButton, expandButton.frame.contains(convertedLocation) {
+                // TODO: show all emojis
+            }
         } else {
             delegate?.handleViewItemTapped(viewItem, gestureRecognizer: gestureRecognizer)
         }