Allow for autosizing of non-centre regions of a border layout

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Currently, autosizing of the north region of a border layout may go wrong,
depending on whether the contents have entirely loaded or not.  The most
obvious culprit is images.  If these have not yet loaded, then the size of
that area will be misreported.

When autosizing such areas, find any children containing images, and add a
listener for when they finish loading.  Only when all listeners have
completed, perform the doLayout() call.  Ensure to remove all those
listeners once that is done.

Original issue reported on code.google.com by susanjg...@gmail.com on 17 Jul 2008 at 1:49

[GoogleCodeExporter]

Original comment by sgod...@gmail.com on 17 Jul 2008 at 1:49

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

Original comment by sgod...@gmail.com on 17 Jul 2008 at 1:49

[GoogleCodeExporter]

Original comment by sgod...@gmail.com on 17 Jul 2008 at 1:50

• Changed title: Allow for autosizing of non-centre regions of a border layout