riched20: fix crash undoing a paste

[Clinton Stimpson]

Hi,

This patch fixes bug 7144.
An extra undo item was added which results in the wrong undo operations, 
and sometimes a crash.
Also added a test to test copy/paste with undo/redo.  The test will 
crash without the fixes.

Thanks,
Clinton Stimpson

ChangeLog
    riched20:  Fix crashes when undoing paste operations

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