src/share/classes/sun/swing/LightweightContent.java
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*** 177,182 ****
--- 177,190 ----
/**
* {@code JLightweightFrame} calls this method to notify the client
* application that the content minimum size has changed.
*/
public void minimumSizeChanged(int width, int height);
+
+ /**
+ * Invokes a runnable on the client's toolkit thread
+ * @param r a runnable to invoke
+ */
+ default public void invokeOnClientToolkitThread(Runnable r) {
+ throw new UnsupportedOperationException("Unsupported client implementation");
+ }
}