Update card view less often

Speculative fix for #314

Tusker/Screens/Preferences/Appearance/MockStatusView.swift

@@ -135,12 +135,11 @@ private struct MockStatusCardView: UIViewRepresentable {
     func makeUIView(context: Context) -> StatusCardView {
         let view = StatusCardView()
         view.isUserInteractionEnabled = false
-        let card = Card(
+        let card = StatusCardView.CardData(
             url: WebURL("https://vaccor.space/tusker")!,
-            title: "Tusker",
-            description: "Tusker is an iOS app for Mastodon",
             image: WebURL("https://vaccor.space/tusker/img/icon.png")!,
-            kind: .link
+            title: "Tusker",
+            description: "Tusker is an iOS app for Mastodon"
         )
         view.updateUI(card: card, sensitive: false)
         return view

Tusker/Views/Status/StatusCardView.swift

@@ -9,6 +9,7 @@
 import UIKit
 import Pachyderm
 import SafariServices
+import WebURL
 import WebURLFoundationExtras
 import HTMLStreamer
 
@@ -18,7 +19,7 @@ class StatusCardView: UIView {
     weak var actionProvider: MenuActionProvider?
     
     private var statusID: String?
-    private(set) var card: Card?
+    private(set) var card: CardData?
     
     private static let activeBackgroundColor = UIColor.secondarySystemFill
     private static let inactiveBackgroundColor = UIColor.secondarySystemBackground
@@ -163,20 +164,22 @@ class StatusCardView: UIView {
     }
     
     func updateUI(status: StatusMO) {
-        guard status.id != statusID else {
+        let newData = status.card.map { CardData(card: $0) }
+        guard self.card != newData else {
             return
         }
-        self.card = status.card
+        self.card = newData
         self.statusID = status.id
         
-        guard let card = status.card else {
+        guard let newData else {
             return
         }
         
-        updateUI(card: card, sensitive: status.sensitive)
+        updateUI(card: newData, sensitive: status.sensitive)
     }
     
-    func updateUI(card: Card, sensitive: Bool) {
+    // This method is internal for use by MockStatusView
+    func updateUI(card: CardData, sensitive: Bool) {
         if let image = card.image {
             if sensitive {
                 if let blurhash = card.blurhash {
@@ -244,6 +247,30 @@ class StatusCardView: UIView {
         setNeedsDisplay()
     }
     
+    struct CardData: Equatable {
+        let url: WebURL
+        let image: WebURL?
+        let title: String
+        let description: String
+        let blurhash: String?
+        
+        init(card: Card) {
+            self.url = card.url
+            self.image = card.image
+            self.title = card.title
+            self.description = card.description
+            self.blurhash = card.blurhash
+        }
+        
+        init(url: WebURL, image: WebURL? = nil, title: String, description: String, blurhash: String? = nil) {
+            self.url = url
+            self.image = image
+            self.title = title
+            self.description = description
+            self.blurhash = blurhash
+        }
+    }
+
 }
 
 extension StatusCardView: UIContextMenuInteractionDelegate {