[3/3] richedit: Protect deletion of cell boundaries when not deleting row

[Dylan Smith]

Still need to make sure the paragraph format is transferred properly
when deleting an empty row before a table.  Also need to handle tabs so
that more cells aren't inserted that can't be easily deleted.
---
 dlls/riched20/caret.c  |   22 +++++++++----
 dlls/riched20/editor.c |   18 ++++++------
 dlls/riched20/editor.h |    5 ++-
 dlls/riched20/table.c  |   75 ++++++++++++++++++++++++++++++++++++++++++++++++
 dlls/riched20/undo.c   |    2 +-
 5 files changed, 103 insertions(+), 19 deletions(-)
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