simple reproduce steps

Issue 1:
1. merge B2: D4
2. insert/remove row at row 2 or 3
3. nothing happen

• if row 2 or 3 has non-blank cell, this will be correct.
• row 1 won't happen this issue

Issue 2:
1. merge B2: D4
2. insert/delete column C or D
3. cells become chaos

• if column C or D has non-blank cell, this will be correct.
• column B won't happen this issue

origin reproduce steps

I found there are several situations.

First, merge a cell (for example G7:I9)

Situation A:
1. select row 8 perform "insert rows" operation
2. nothing happen
above situation is the same when choose row 9, but choose row 7 will work.
when choose column H, I will not work, but column G will work.

Situation B:
When choose column H, I then perform insert column the cell view will become chaos.

Situation C:
When choose column H, I then perform delete column the cell view will become chaos.

another interesting about this issue is:
When I apply a style(ex. font, background-color, border) on the merge cell then perform the operation in above situation will work fine.