src/java.desktop/unix/classes/sun/awt/X11/XTextFieldPeer.java

*** 279,294 ****
--- 279,297 ----
          repaintText();
      }
  
      @Override
      public void setFont(Font f) {
+         boolean isChanged = false;
          synchronized (getStateLock()) {
              font = f;
              if (xtext != null && xtext.getFont() != f) {
                  xtext.setFont(font);
+                 isChanged = true;
              }
          }
+         if (isChanged)
              xtext.validate();
      }
  
      /**
       * Deselects the highlighted text.