Toggle Follow mode.
With a prefix argument ARG, enable Follow mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
Follow mode is a minor mode that combines windows into one tall
virtual window. This is accomplished by two main techniques:
* The windows always displays adjacent sections of the buffer.
This means that whenever one window is moved, all the
others will follow. (Hence the name Follow mode.)
* Should the point (cursor) end up outside a window, another
window displaying that point is selected, if possible. This
makes it possible to walk between windows using normal cursor
Follow mode comes to its prime when used on a large screen and two
side-by-side windows are used. The user can, with the help of Follow
mode, use two full-height windows as though they would have been
one. Imagine yourself editing a large function, or section of text,
and being able to use 144 lines instead of the normal 72... (your
mileage may vary).
To split one large window into two side-by-side windows, the commands
`C-x 3' or `M-x follow-delete-other-windows-and-split' can be used.
Only windows displayed in the same frame follow each other.
This command runs the normal hook `follow-mode-hook'. Keys specific to Follow mode: Uses keymap `follow-mode-map', which is not currently defined. (fn &optional ARG)