Reduce flicker during zone window resize

forge-gui-desktop/src/main/java/forge/view/FDialog.java

@@ -305,6 +305,10 @@ public class FDialog extends SkinnedDialog implements ITitleBarOwner, KeyEventDi
         getRootPane().setCursor(Cursor.getPredefinedCursor(resizeCursor0));
     }
 
+    public boolean isResizing() {
+        return sizeBeforeResize != null;
+    }
+
     private void addResizeSupport() {
         final JRootPane resizeBorders = getRootPane();
         resizeBorders.addMouseListener(new MouseAdapter() {

forge-gui-desktop/src/main/java/forge/view/arcane/CardArea.java

@@ -97,7 +97,7 @@ public class CardArea extends CardPanelContainer implements CardPanelMouseListen
     }
 
     @Override
-    public final void doLayout() {
+    public void doLayout() {
         if (this.getCardPanels().isEmpty()) {
             return;
         }

forge-gui-desktop/src/main/java/forge/view/arcane/FloatingCardArea.java

@@ -41,12 +41,14 @@ import forge.view.FFrame;
 import java.awt.Component;
 import java.awt.Point;
 import java.awt.Rectangle;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
 import java.awt.event.MouseEvent;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
-
 import javax.swing.ScrollPaneConstants;
+import javax.swing.Timer;
 
 
 public class FloatingCardArea extends CardArea {
@@ -284,6 +286,29 @@ public class FloatingCardArea extends CardArea {
         }
     }
 
+    @Override
+    public void doLayout() {
+        if (window.isResizing()) {
+            //delay layout slightly to reduce flicker during window resize
+            layoutTimer.restart();
+        }
+        else {
+            finishDoLayout();
+        }
+    }
+
+    final Timer layoutTimer = new Timer(250, new ActionListener() {
+        @Override
+        public void actionPerformed(ActionEvent arg0) {
+            layoutTimer.stop();
+            finishDoLayout();
+        }
+    });
+
+    private void finishDoLayout() {
+        super.doLayout();
+    }
+
     @Override
     public final void mouseOver(final CardPanel panel, final MouseEvent evt) {
         CMatchUI.SINGLETON_INSTANCE.setCard(panel.getCard(), evt.isShiftDown());