(emacs)Completion Example

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Completion Example

   A concrete example may help here.  If you type `M-x au TAB', the TAB
looks for alternatives (in this case, command names) that start with
`au'.  There are only two: `auto-fill-mode' and `auto-save-mode'.
These are the same as far as `auto-', so the `au' in the minibuffer
changes to `auto-'.

   If you type TAB again immediately, there are multiple possibilities
for the very next character--it could be `s' or `f'--so no more
characters are added; instead, TAB displays a list of all possible
completions in another window.

   If you go on to type `f TAB', this TAB sees `auto-f'.  The only
command name starting this way is `auto-fill-mode', so completion fills
in the rest of that.  You now have `auto-fill-mode' in the minibuffer
after typing just `au TAB f TAB'.  Note that TAB has this effect
because in the minibuffer it is bound to the command
`minibuffer-complete' when completion is available.

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