The reason was the backing-store scroll mechanism, which was
the best option back in the days when jdk1.2 was used to
develop red. This backing-store mode has problems with the
scrollToRectangle method (documented in JViewport.java)
With jdk1.3 a new scroll mode has appeared which works with
bitblt and is of course much faster. So the only thing to do
was to eliminate the setScrollMode line from RSE.java.
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The reason was the backing-store scroll mechanism, which was
the best option back in the days when jdk1.2 was used to
develop red. This backing-store mode has problems with the
scrollToRectangle method (documented in JViewport.java)
With jdk1.3 a new scroll mode has appeared which works with
bitblt and is of course much faster. So the only thing to do
was to eliminate the setScrollMode line from RSE.java.