Doesn't deal correctly with subcolumns

[FFY00]

+------------+---------------+---------------+-----------+
| Byte 1     | Byte 2                        | Byte 3    |
+============+===============+===============+===========+
|            | bit 0..3      | bit 4..7      |           |
+------------+---------------+---------------+-----------+
| param1     | param2        | param3        | param4    |
+------------+---------------+---------------+-----------+

Gets transformed into

+--------+----------+----------+--------+
| Byte 1 | Byte 2   | Byte 3   |        |
+========+==========+==========+========+
|        | bit 0..3 | bit 4..7 |        |
+--------+----------+----------+--------+
| param1 | param2   | param3   | param4 |
+--------+----------+----------+--------+

[gu-fan]

hmmm, cross column can not be edited correctly , you can split the multi-col column