[gui][patch] image, icon, and scrollpane layout fixes

[graydon hoare]

hi,

I've just committed this patch to java-gui-branch. various fixes for 
bugs uncovered with recent swing-trail testing, nothing terribly upsetting.

-graydon

2004-06-29  Graydon Hoare  <graydon@redhat.com>

	* java/awt/image/BufferedImage.java
	(getSource): Implement.
	* javax/swing/ImageIcon.java
	(ImageIcon): Implement ctor.
	* javax/swing/ScrollPaneLayout.java
	(preferredLayoutSize): Be more careful about nulls.
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