Send a large reaction on the first hold in the reactions window (#87)

Holding an emoji in the full reactions window did nothing the first
time it was used: while the hold ran, the row was rebuilt with fresh
item data, and the check that the cursor was still on the same emoji
compared the whole item, so it failed. The hold now matches the emoji
by its file and position.

Author: zweeltow

packages/EntertainmentUI/Sources/EntertainmentUI/EmojiesSectionRowItem.swift

@@ -21,6 +21,20 @@ import InlineStickerLayer
 
 private let largeReactionHoldDuration: Double = 0.8
 
+private func isSameEmojiEntry(_ lhs: EmojiesSectionRowItem.Item?, _ rhs: EmojiesSectionRowItem.Item?) -> Bool {
+    guard let lhs, let rhs, lhs.rect == rhs.rect else {
+        return false
+    }
+    switch (lhs, rhs) {
+    case let (.item(_, lhsItem, _, _), .item(_, rhsItem, _, _)):
+        return lhsItem.file.fileId == rhsItem.file.fileId
+    case (.more, .more):
+        return true
+    default:
+        return false
+    }
+}
+
 public final class EmojiesSectionRowItem : GeneralRowItem {
 
     public enum Item : Equatable {
@@ -633,7 +647,7 @@ private final class EmojiesSectionRowView : TableRowView, ModalPreviewRowViewPro
                 return
             }
             self.largeHoldTimer = nil
-            if self.itemUnderMouse?.1 == current.1, let sticker = current.1.item, let window = self.window, let item = self.item as? EmojiesSectionRowItem {
+            if isSameEmojiEntry(self.itemUnderMouse?.1, current.1), let sticker = current.1.item, let window = self.window, let item = self.item as? EmojiesSectionRowItem {
                 self.largeInvoked = true
                 let wrect = self.contentView.convert(current.1.rect, to: nil)
                 let srect = window.convertToScreen(wrect)
@@ -670,7 +684,7 @@ private final class EmojiesSectionRowView : TableRowView, ModalPreviewRowViewPro
     }
     private func updateDragging() {
         if largeHoldTimer != nil {
-            if self.itemUnderMouse?.1 != self.currentDownItem?.1 {
+            if !isSameEmojiEntry(self.itemUnderMouse?.1, self.currentDownItem?.1) {
                 cancelLargeHold()
                 self.currentDownItem = nil
             }
@@ -708,7 +722,7 @@ private final class EmojiesSectionRowView : TableRowView, ModalPreviewRowViewPro
         }
         if largeHoldTimer != nil {
             cancelLargeHold()
-            if self.currentDownItem?.1 == self.itemUnderMouse?.1 {
+            if isSameEmojiEntry(self.currentDownItem?.1, self.itemUnderMouse?.1) {
                 self.click()
             }
             self.currentDownItem = nil