RE: completion.el users?

["Drew Adams" <drew.adams@oracle.com>]

> Wasn't completion.el forked to helm, which
> obsoleted it?

No.  No relation.  (Helm replaced Anything.)

From the Commentary of completion.el:

-----------8<----------

After you type a few characters, pressing the "complete" key
inserts the rest of the word you are likely to type.

This watches all the words that you type and remembers them.
When typing a new word, pressing "complete" (meta-return)
"completes" the word by inserting the most recently used
word that begins with the same characters.  If you press
meta-return repeatedly, it cycles through all the words it
knows about.

If you like the completion then just continue typing, it is
as if you entered the text by hand.  If you want the
inserted extra characters to go away, type control-w or
delete.  More options are described below.

The guesses are made in the order of the most
recently "used".  Typing in a word and then typing a
separator character (such as a space) "uses" the word.  So
does moving a cursor over the word.  If no words are found,
it uses an extended version of the dabbrev style completion.

You automatically save the completions you use to a file
between sessions.

Completion enables programmers to enter longer, more
descriptive variable names while typing fewer keystrokes
than they normally would.

...