bug#45915: 27.2; deletechar distorts org-table

[Tak Kunihiro]

>> I confirm that there still is following problem on 27.1.91.
>> Could someone take a look and show me work around?
> 
> I cannot reproduce this with latest Org stable version 9.4.5.
> 
> Can you try again and report?

I downloaded Org 9.4.5 and reproduced the problem on 26.3, 27.2,
and 28.0.50. Here is a recipe again.

> On certain condition, typing <deletechar> distorts alignment of
> a table.  Then, typing <up> moves point to previous line but far
> right position (column 14 instead of column 2).
> 
> |   | rownames |     |   | rownames |
> | / | <l>      |     | / | <l>      |
> |---+----------| ->  |---+----------|
> | / | a        |     |  | a        |
> 
> Here is a recipe to reproduce the glitch started from emcas -Q. 
> 
> 1. Create a buffer with (text-mode) and yank following table.
> 
> |   | rownames |
> | / | <l>      |
> |---+----------|
> |   | a        |
> 
> 2. (progn (require 'org) (call-interactively 'orgtbl-mode))
> 3. Move point to the first column and the third line with letter 'a'.
> 4. Hit <S-return>.
> 5. Hit <deletechar>.
> 6. Hit <up>.