avoid having the keyboard focus jump around when the window is resized

src/main/java/forge/gui/framework/DragCell.java

@@ -300,6 +300,11 @@ public final class DragCell extends JPanel implements ILocalRepaint {
      * @param doc0   {@link forge.gui.framework.IVDoc} tab document.
      */
     public void setSelected(final IVDoc<? extends ICDoc> doc0) {
+        if (null != doc0 && docSelected == doc0) {
+            // already selected
+            return;
+        }
+        
         docSelected = null;
         pnlBody.removeAll();
 

src/main/java/forge/gui/framework/SResizingUtil.java

@@ -1,5 +1,6 @@
 package forge.gui.framework;
 
+import java.awt.Component;
 import java.awt.Cursor;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
@@ -10,8 +11,10 @@ import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionAdapter;
 import java.awt.event.MouseMotionListener;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import javax.swing.JPanel;
 
@@ -106,7 +109,6 @@ public final class SResizingUtil {
         }
     };
 
-    /** */
     public static void resizeWindow() {
         final List<DragCell> cells = FView.SINGLETON_INSTANCE.getDragCells();
         final JPanel pnlContent = FView.SINGLETON_INSTANCE.getPnlContent();
@@ -122,6 +124,11 @@ public final class SResizingUtil {
         double roughVal = 0;
         int smoothVal = 0;
         
+        Set<Component> existingComponents = new HashSet<Component>();
+        for (Component c : pnlContent.getComponents()) {
+            existingComponents.add(c);
+        }
+
         // This is the core of the pixel-perfect layout. To avoid <20>1 px errors on borders
         // from rounding individual panels, the intermediate values (exactly accurate, in %)
         // for width and height are rounded based on comparison to other panels in the
@@ -151,8 +158,13 @@ public final class SResizingUtil {
             // X and Y coordinate can be rounded as usual.
             cellA.setSmoothX((int) Math.round(cellA.getRoughX() * w));
             cellA.setSmoothY((int) Math.round(cellA.getRoughY() * h));
+
+            // only add component if not already in container; otherwise the keyboard focus
+            // jumps around to the most recenly added component 
+            if (!existingComponents.contains(cellA)) {
                 pnlContent.add(cellA);
             }
+        }
 
         // Lock in final bounds and build heads.
         for (final DragCell t : cells) {