Variable: org-tab-first-hook
org-tab-first-hook is an alias for org-cycle-tab-first-hook, defined
in org-cycle.el.gz.
Value
(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
Documentation
Hook for functions to attach themselves to TAB.
See org-ctrl-c-ctrl-c-hook for more information.
This hook runs as the first action when TAB is pressed, even before
org-cycle messes around with the outline-regexp to cater for
inline tasks and plain list item folding.
If any function in this hook returns t, any other actions that
would have been caused by TAB (such as table field motion or visibility
cycling) will not occur.