[cp-patches] FYI: PlainView update partially fixes bug 24152

[Anthony Balkissoon]

This fix for PlainView solves one of the problems that was leading to
bug 24152, but it is not done yet.

The bug report is viewable here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24152

This caches the length of the longest line in the View so that it
doesn't have to be calculated each time.

However, we need to add a way to update this when the Document changes,
I think it might be through the updateDamaged method and a
DocumentListener, but I'm not 100% sure, I'm still working through it.

This change leads to significantly better results than posted in the bug
report.  However, the very first time the text is shown there is still a
huge delay, and this will again be fixed if we can update the longest
line whenever the Document is updated, then we'll have it calculated as
soon as it was initialized with some text.  So this is still a work in
progress.


2005-10-03  Anthony Balkissoon  <address@hidden>

        * javax/swing/text/PlainView.java:
        (maxLineLength): New variable to cache the length of the longest line.
        (determineMaxLength): New implementation method.
        (getPreferredSpan): Call determine max length instead of calculating
        it here.

--Tony