[FR] Add eldoc support to show cell contents in shrunk table

[Nicholas Harrison <nicholasharrison222@gmail.com>]

I'm trying to create an automatic way to see the full contents of an
org table cell while keeping the table compact. I've discovered
org-table-shrink and then display-local-help to see the contents, but
I want this to be done automatically using eldoc. I grabbed and
modified a function from org-eldoc.el which could be added into
org-eldoc-documentation-function:

(defun org-eldoc-get-cell-contents ()
  "Return cell contents if in a shrunken table cell."
  (let ((case-fold-search t))
    (save-excursion
      (save-match-data
        (when (org-at-table-p)
          (display-local-help))))))

I don't really know what I'm doing since I'm not a developer of Emacs
or org-mode and straight up using display-local-help doesn't seem
right to me. I think I have unneeded code in there too. Does anyone
have a better direction on how to get the cell contents when in an org
table or corrections to this function?

Nicholas