PATCH: XGraphicsConfiguration implement font metrics cache

[Scott Gilbertson]

I came accross a comment that said "FIXME: do caching", so I did.  I see a
couple of possible problems with this patch, though:
 1. it assumes that visual.getScreen().getDisplay() always returns the same
value
 2. if you use many different fonts, the cache will just keep growing
My guess is that #1 is a valid assumption.  Regarding #2, I considered using
weak references, but that would risk having fonts taken out of the cache
immediately before they're needed again, so I decided against it.

To test it, I ran my application which uses Graphics.setFont in a lot of the
paint functions, and confirmed that a few different fonts show up properly.
I also noticed a large speed improvement when painting a lot of text fields.

Index: libjava/ChangeLog
from  Scott Gilbertson  <scottg@mantatest.com>

 * XGraphicsConfiguration.getXFontMetrics:  implemented cache to improve
performance

patch is attached.

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