From 4217de15a344b86bff9f383775fb2d88ede9b40a Mon Sep 17 00:00:00 2001
From: Craig Raw <craigraw@gmail.com>
Date: Thu, 14 Jul 2022 08:35:31 +0200
Subject: [PATCH] avoid unnecessary computation during entry cell sizing on
 table scrolls

---
 .../java/com/sparrowwallet/sparrow/control/EntryCell.java | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/main/java/com/sparrowwallet/sparrow/control/EntryCell.java b/src/main/java/com/sparrowwallet/sparrow/control/EntryCell.java
index ad411042..49597b1f 100644
--- a/src/main/java/com/sparrowwallet/sparrow/control/EntryCell.java
+++ b/src/main/java/com/sparrowwallet/sparrow/control/EntryCell.java
@@ -36,6 +36,8 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
     public static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm");
     private static final Pattern REPLACED_BY_FEE_SUFFIX = Pattern.compile("(.*)\\(Replaced By Fee( #)?(\\d+)?\\).*");
 
+    private static EntryCell lastCell;
+
     public EntryCell() {
         super();
         setAlignment(Pos.CENTER_LEFT);
@@ -47,6 +49,12 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
     protected void updateItem(Entry entry, boolean empty) {
         super.updateItem(entry, empty);
 
+        //Return immediately to avoid CPU usage when updating the same invisible cell to determine tableview size (see https://bugs.openjdk.org/browse/JDK-8280442)
+        if(this == lastCell && !getTableRow().isVisible()) {
+            return;
+        }
+        lastCell = this;
+
         applyRowStyles(this, entry);
 
         if(empty) {