jogl: do the clearGlobalFocusOwner() call on the AWT EDT in NewtCanvasAWT

Otherwise we can deadlock in the native focusrequest calls from the AWT thread,
see bug 879 for the details.

Signed-off-by: Harvey Harrison <[email protected]>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index e5c76f25d..e1a819e77 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -212,7 +212,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
             if( isParent && !isFullscreen ) { // must be parent of newtChild _and_ newtChild not fullscreen
                 if( isOnscreen ) {
                     // Remove the AWT focus in favor of the native NEWT focus
-                    KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
+                    AWTEDTExecutor.singleton.invoke(false, awtClearGlobalFocusOwner);
                 }
                 else {
                     // In offscreen mode we require the focus!
@@ -227,6 +227,14 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
     }
     private final FocusAction focusAction = new FocusAction();
 
+    private static class ClearFocusOwner implements Runnable {
+        @Override
+        public void run() {
+            KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
+        }
+    }
+    private static final Runnable awtClearGlobalFocusOwner = new ClearFocusOwner();
+
     /** Must run on AWT-EDT non-blocking, since it invokes tasks on AWT-EDT w/ waiting otherwise. */
     private final Runnable awtClearSelectedMenuPath = new Runnable() {
         @Override