[cp-patches] Patch: several fixes for DefaultStyledDocument

[Anthony Balkissoon]

This is the first part of the work I'm doing on DefaultStyledDocument.
This fixes a couple issues associated with PR 24744 but the bug is not
completely fixed yet, so the testcase for that PR still crashes.  I will
continue to work on this but these changes are ready to go in and may
help get some text/html test apps up and running so I'm committing this
now.

2005-12-19  Anthony Balkissoon  <address@hidden>

        * javax/swing/text/DefaultStyledDocument.java:
        (endOffset): New field.
        (ElementBuffer.insert): If length is 0 return early.  Set the endOffset
        variable here.
        (ElementBuffer.insertContentTag): Added special case for when insertion
        covers entire range of the current Element.  Replaced (offset + length)
        with endOffset everywhere.  Added checks to see if the insertion has 
        the same attributes as the surrounding Element(s), in which case we
        don't split them, we join them.
        (SectionElement.getName): Return the field SectionElementName instead 
        of hardcoding a return value.
        (getLogicalStyle): As the specs require, if the attributes from the 
        resolve parent aren't of type Style, return null.
        (setCharacterAttributes): Exit early if length is 0.  Obtain a 
        write lock for the body of this method.  Changed the way we iterate
        through the paragraphs to be more efficient and more intuitive.  Added
        AttributeUndoableEdits to the DocumentEvent and fired the 
        UndoableEditUpdate.
        (setLogicalStyle): Return early if the Element is null.  Obtain a write
        lock for the body of this method.  Fire the appropriate DocumentEvent.
        (setParagraphAttributes): Changed the way we iterated through the 
        paragraphs because it was incorrect and unintuitive.  Obtained a write
        lock within a try/finally block.  Added AttributeUndoableEdits to the 
        DocumentEvent and fired the event.
        (insertUpdate): Changed the way we iterate because we cannot assume 
        the Segment holds the characters starting from index 0.  Give the 
        startTag the same attributes as the paragraph.  Removed the useless
        offset += len line because len is 0.
        (printElements): New temporary debugging method.
        (attributeSetsAreSame): New method.

--Tony

DefaultStyledDocumentFixes1.diff
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