[5/17] richedit: Protect deletion of cell boundaries when not deleting row (try 2)

[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  |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
 dlls/riched20/undo.c   |    2 +-
 5 files changed, 89 insertions(+), 19 deletions(-)
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