* lisp/org-table.el (org-table-electric-header-p): New option.
(org-table-temp-header-line, org-table-electric-header-mode): New
variables.
(org-table-set-header-line-format)
(org-table-electric-header-mode): New minor mode to display the
table's current first row as the header line when this first row
is not visible anymore.
* doc/org-manual.org (Miscellaneous): Document
`org-table-electric-header-mode'.
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