7158311: GraphicsDevice.setDisplayMode(...) leads to hang when DISPLAY...

7158311: GraphicsDevice.setDisplayMode(...) leads to hang when DISPLAY variable points to Oracle Linux
8001463: Regression : Deadlock between AWT-XAWT thread and AWT-EventQueue-0 Thread when screen resolution changes
Reviewed-by: art, serb
Contributed-by: alexander.zvegintsev@oracle.com

src/solaris/classes/sun/awt/X11/XToolkit.java

@@ -240,9 +240,14 @@ public final class XToolkit extends UNIXToolkit implements Runnable {
                 @Override
                 public void dispatchEvent(XEvent ev) {
                     if (ev.get_type() == XConstants.ConfigureNotify) {
+                        awtUnlock();
+                        try {
                             ((X11GraphicsEnvironment)GraphicsEnvironment.
                              getLocalGraphicsEnvironment()).
                                 displayChanged();
+                        } finally {
+                            awtLock();
+                        }
                     }
                 }
             });