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());

forge-gui/CHANGES.txt

@@ -22,6 +22,7 @@ Clicking the zone icon under a player's avatar will now hide the zone window if
 After the last card is removed from a zone window, that window will now automatically be hidden. An example of this would be casting the last card in the Flashback zone.
 Default size of zone windows has been slightly reduced.
 Prevent horizontal scrollbar appearing in zone windows.
+Reduce flicker when resizing zone windows 
 
 ---------
 New Cards