NEWT/OSX: Proper impl. of NEWT's focus management (fixes NEWT/AWT focus behavior/tests)

- Old code was just requesting the focus and made the window upfront
  and notifying a gained focus to WindowImpl. (hack)

- Using proper requestFocus impl. issuing focusAction() and utilizing native
  focus gained/lost messages. This distinguish between 'makeKey' and 'orderFront'.
  Also requesting and accepting (view) first responder role, which is a precursor
  to proper gained/lost focus handling on OSX.

- NEWTCanvasAWT: Adding 'steal AWT focus':
   +++
   void requestFocus() {
     super.requestFocus(); // AWT
     < steal AWT focus >
     NEWTChild.requestFocus()
   }
   +++
   Helps make the focus traversal between NEWT/AWT more reliable.
   Happend on OSX that AWT (NewtCanvasAWT instance) didn't release the focus
   after NEWT child gained the same.
   We are not able to use the 'focusAction()' here (disabled in this code path)
   due to AWT-EDT blocking and recursive focus changes. The latter is also
   intendend to request the AWT focus first ..

- AWT/NEWT focus test 01 passes on OSX

1 files changed, 4 insertions, 0 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index b2d97c7d5..47977610f 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -307,6 +307,10 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
     final void requestFocusNEWTChild() {
         if(null!=newtChild) {
             newtChild.setFocusAction(null);
+            // FIXME: Experimental 'steal AWT focus',
+            // since we have to disable the focus action due to recursion and AWT EDT blocking.
+            KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
+            kfm.clearGlobalFocusOwner();            
             newtChild.requestFocus();
             newtChild.setFocusAction(focusAction);
         }