less repaints when updating text on buttons.

core/src/main/java/com/github/weisj/darklaf/ui/button/DarkButtonListener.java

@@ -31,8 +31,6 @@ import java.beans.PropertyChangeEvent;
 import javax.swing.*;
 import javax.swing.plaf.basic.BasicButtonListener;
 
-import com.github.weisj.darklaf.util.PropertyKey;
-
 public class DarkButtonListener extends BasicButtonListener {
 
     private final DarkButtonUI ui;
@@ -77,12 +75,8 @@ public class DarkButtonListener extends BasicButtonListener {
         super.propertyChange(e);
         AbstractButton b = (AbstractButton) e.getSource();
         String key = e.getPropertyName();
-        if (key.startsWith("JButton.")
-            || PropertyKey.FOCUSABLE.equals(key)
-            || AbstractButton.TEXT_CHANGED_PROPERTY.equals(key)) {
-            b.revalidate();
-            b.doLayout();
-            b.repaint();
+        if (key.startsWith("JButton.")) {
+            b.invalidate();
         }
     }
 }

core/src/main/java/com/github/weisj/darklaf/ui/button/DarkButtonUI.java

@@ -158,10 +158,11 @@ public class DarkButtonUI extends BasicButtonUI implements ButtonConstants {
         AbstractButton b = (AbstractButton) c;
         paintButtonBackground(g, c);
 
-        if (ButtonConstants.isDefaultButton(b)) {
-            g.setFont(g.getFont().deriveFont(Font.BOLD));
-        } else if (g.getFont().isBold()) {
-            g.setFont(g.getFont().deriveFont(Font.PLAIN));
+        Font font = g.getFont();
+        if (ButtonConstants.isDefaultButton(b) && !font.isBold()) {
+            g.setFont(font.deriveFont(Font.BOLD));
+        } else if (font.isBold()) {
+            g.setFont(font.deriveFont(Font.PLAIN));
         }
 
         String text = layout(b, c, SwingUtilities2.getFontMetrics(b, g), b.getWidth(), b.getHeight());