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Currently, the title is only set on supported terminals (i.e. xterm,
urxvt, screen etc.). Using terminfo entries to set the terminal title
adds support for many more terminals.

This prevents it from malfunctioning when `setopt prompt_subst` is off.

Add support for variant "utf8" locale suffix spelling. Fix dumb bug in iconv call that would cause it to hang.

For unspecified encodings, assume it's UTF-8 or compatible (e.g. ASCII) and muddle through without character encoding conversion.

In termsupport, use LC_CTYPE instead of LANG to enable byte-by-byte text processing. LANG doesn't seem to actually work.

Remove terminalapp plugin and fold its implementation in to lib/termsupport.zsh. Replaces the redundant Terminal.app support that was recently added to termsupport.

Move the DISABLE_AUTO_TITLE check from title() to the preX hook
functions that call it, to allow the title() function to be used
directly by user or other callers.

contaminating script/function output

In older version of zsh, `add-zsh-hook` is not available, causing issues like:

```
/Users/hugo/.oh-my-zsh/lib/termsupport.zsh:32: add-zsh-hook: function definition file not found
/Users/hugo/.oh-my-zsh/lib/termsupport.zsh:33: add-zsh-hook: function definition file not found
```

See https://github.com/robbyrussell/oh-my-zsh/issues/748. This patch pulls in the changes suggested in https://github.com/robbyrussell/oh-my-zsh/issues/748#issuecomment-37862691 by @mcornella and I have tested it on RHEL 5.

Display the hostname when running Mosh (http://mosh.mit.edu/).
Same thing as displaying "hostname" when running "ssh hostname".

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 #2182

Fixes issue #1884

Revert "Fixed Mac OS X Terminal.app related issue with extra newlines being printed out sometimes"

This reverts commit 8f89d4d5.

Before this patch, commands containing %-signs set the title wrong
(urxvt and xterm) [1] and produce strange output in urxvt [2].

test for bug 1:
> sleep 10 && echo %
sets title to "sleep 10 && echo %<<"
> sleep 10 && echo %f
doesn't change the title at all

test for bug 2 (only urxvt):
> echo %f
39m%f
^^^^^----- output

This is needed to play nice with plugins that need various hooks.