loottracker: Optimize panel rebuild

Removing components in swing can be incredibly slow under serveral
circumstances. This adds a special removeAll that can take less
time in some cases

runelite-client/src/main/java/net/runelite/client/plugins/loottracker/LootTrackerPanel.java

@@ -54,6 +54,7 @@ import net.runelite.client.ui.components.PluginErrorPanel;
 import net.runelite.client.util.ColorUtil;
 import net.runelite.client.util.ImageUtil;
 import net.runelite.client.util.QuantityFormatter;
+import net.runelite.client.util.SwingUtil;
 import net.runelite.http.api.loottracker.LootTrackerClient;
 
 class LootTrackerPanel extends PluginPanel
@@ -488,7 +489,7 @@ class LootTrackerPanel extends PluginPanel
 	 */
 	private void rebuild()
 	{
-		logsContainer.removeAll();
+		SwingUtil.fastRemoveAll(logsContainer);
 		boxes.clear();
 
 		if (groupLoot)

runelite-client/src/main/java/net/runelite/client/plugins/loottracker/LootTrackerPlugin.java

@@ -612,7 +612,7 @@ public class LootTrackerPlugin extends Plugin
 		}
 
 		config.setIgnoredItems(Text.toCSV(ignoredItemSet));
-		panel.updateIgnoredRecords();
+		// the config changed will update the panel
 	}
 
 	boolean isIgnored(String name)

runelite-client/src/main/java/net/runelite/client/util/SwingUtil.java

@@ -26,11 +26,16 @@ package net.runelite.client.util;
 
 import java.awt.AWTException;
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.EventQueue;
 import java.awt.Font;
 import java.awt.Frame;
 import java.awt.Image;
 import java.awt.Insets;
+import java.awt.SecondaryLoop;
 import java.awt.SystemTray;
+import java.awt.Toolkit;
 import java.awt.TrayIcon;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
@@ -50,6 +55,7 @@ import javax.swing.JMenuItem;
 import javax.swing.JOptionPane;
 import javax.swing.JPopupMenu;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
@@ -293,4 +299,54 @@ public class SwingUtil
 	{
 		button.addItemListener(l -> button.setToolTipText(button.isSelected() ? on : off));
 	}
+
+	/**
+	 * Removes all of a component's children faster than calling removeAll() on it in many cases
+	 */
+	public static void fastRemoveAll(Container c)
+	{
+		// If we are not on the EDT this will deadlock, in addition to being totally unsafe
+		assert SwingUtilities.isEventDispatchThread();
+
+		// when a component is removed it has to be resized for some reason, but only if it's valid
+		// so we make sure to invalidate everything before removing it
+		c.invalidate();
+		for (int i = 0; i < c.getComponentCount(); i++)
+		{
+			Component ic = c.getComponent(i);
+
+			// removeAll and removeNotify are both recursive, so we have to recurse before them
+			if (ic instanceof Container)
+			{
+				fastRemoveAll((Container) ic);
+			}
+
+			// each removeNotify needs to remove anything from the event queue that is for that widget
+			// this however requires taking a lock, and is moderately slow, so we just execute all of
+			// those events with a secondary event loop
+			pumpPendingEvents();
+
+			// call removeNotify early; this is most of the work in removeAll, and generates events that
+			// the next secondaryLoop will pickup
+			ic.removeNotify();
+		}
+
+		// Actually remove anything
+		c.removeAll();
+	}
+
+	/**
+	 * Run any events currently in the event queue
+	 */
+	public static void pumpPendingEvents()
+	{
+		EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
+
+		if (eq.peekEvent() != null)
+		{
+			SecondaryLoop l = eq.createSecondaryLoop();
+			SwingUtilities.invokeLater(l::exit);
+			l.enter();
+		}
+	}
 }