[PATCH] fix point position shifting in some org-src instances

[Timothy]

Hi All,

I've noticed for a while that if you have a block with
overlays/invisible characters that editing it with `org-edit-special'
moves the point around.

For example, with Org pretty entities enabled, and █ indicating the
cursor, if I call org-edit-special on a LaTeX fragment like:
  \( \alpha +█\beta \)
which is displayed as \( α +█β \)
The point is moved on creation of the org-src buffer
  \( \alpha + \beta █\)
Then if I move it back to after the "+", on calling `org-edit-src-exit'
the point is moved to
  \(█ \alpha + \beta \)
In the original buffer.

This may seem quite minor, but if you're editing a lot of LaTeX
fragments having the point constantly jumping around can be quite a
pain.

After investigating this, I tried shifting org-src--{goto-}coordinates
to a point-based approach from a column-based approach, and it seems to
have fixed the problem.

I have tested a few other situations (e.g. LaTeX environments, example
blocks, src blocks), and it seems to work well.

--
Timothy

0001-org-src-Use-point-instead-of-column-for-coords.patch
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