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Blinking window



I have a text editing application (Thinker) that does its 
own character editing.  The application is modeled after
Doug Engelbart's NLS system of yore.  I never saw
a way to use TextArea's.   Anyway, after the transition
to Java 1.4 the full main window blinks every once
and a while while typing.  I have tried to isolate
the cause (suspecting some interaction with the timer
driven process that blinks the text cursor) and wonder
if anyone has seen this and might know in general what
might cause it.

The blink is a complete window erase and redraw including
all the buttons and window dressing.

I cannot produce small units of code that demonstrate
it, and the application is large and poorly structured
(proving my axiom that one can write Fortran programs
in any language) having converted from Amiga -> Mac ->
Windows -> Java/Swing. 

Sorry about the lack of specifics, I am asking only
if someone has seen this <blink> behavior, and if so what
caused it.
-- 
Government is the only enterprise in the world which expands in size when
its failures increase. - Janice Rogers Brown.
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