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Since e537ee9d, the reverse-menu-complete keybinding has no longer been
properly bound (it was accidentally bound to the delete key).

This commit again binds it to shift-tab.

Fixes formatting on some rare cases when a percent ends up
in the $CMD variable, like these below:

- When assigning a variable, $CMD ends up with the second parameter;
in this case, $CMD will contain '+%s%N', messing with the syntax:

 $ a=`date +%s%N`

- A function (or command in general) that contains a percent symbol:

 $ to\%() { echo $(( $1 * 100 / $3))\% } # $CMD=to%()
 $ to% 2 of 10 # $CMD=to%

Fixes #2641, #2642

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.

Fixes #2641, #2642

Delete key (of Fn+Delete on Mac) would print "~" instead of deletion.

Aligned comments

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>

The manual configuration of ':completion:*:hosts' causes some problems
(e.g. issue #1337), and misses useful information (especially from
~/.ssh/known_hosts; issue #690 and issue #1009).

The best option appears to be using zsh's default configuration for
':completion:*:hosts'.

While rebasing this for a new pull request (#1498 got closed by accident
and then requests to re-open it got ignored), it also drops the `users
off` setting: completion of user names can be useful, and the commit
adding it (c4434d2d) does not state why.

Those aliases should be in user's .zshrc file, instead of being default.

Fixes #2182

Just activate word-splitting.

- Allows for the user to turn on auto-correction using the
$ENABLE_CORRECTION variable
- Adds aliases regardless of variable assignment to aid users that use
setopt to turn correction back on in their zshrc

background.

We can easily see which color we want to set when changing the PS1 shell variable,
since the colors are more distinctive.

Fixes issue #1884