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* java/awt/EventQueue.java
(Queue): New inner class. Implements the actual queue.
(LOW_PRIORITY): New constant field.
(NORM_PRIORITY): New constant field.
(queueHead): Removed. Moved into Queue.
(queueTail): Removed. Moved into Queue.
(queues): New field.
(EventQueue): Initialize two internal queues, one for
normal events, one for low priority events.
(getNextEventImpl): New helper method, fetches the next event.
(getNextEvent): Use getNextEventImpl() for fetching the event.
(peekEvent): Use getNextEventImpl() for fetching the event.
(peekEvent(int)): Search for event in all queues.
(postEventImpl(AWTEvent)): Moved actual posting into
postEventImpl(AWTEvent,int). Prioritize events here.
(postEventImpl(AWTEvent,int)): Take priority parameter and insert
event into correct queue. Re-enable event coalescing.
* gnu/java/awt/LowPriorityEvent.java: New marker interface.
* javax/swing/RepaintManager.java
(RepaintWorkerEvent): New internal class. This is a low priority
event for the repaint worker.
(addDirtyRegion): Use new internal invokeLater() for sending
a low priority event.
(addInvalidComponent): Use new internal invokeLater() for sending
a low priority event.
(commitBuffer): Added some null checks.
(invokeLater): New helper method. Sends a low priority
repaint worker event on the event queue.
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