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Fixes #7527

Fixes #7117

This reverts commit 9544316e.

This setting broke mouse / touchpad scroll on programs using `less` output
due to it not using the alternate screen buffer.

Fixes #7025

The option '-F' causes 'less' to automatically quit if the contents fit 
the screen and the option '-X' causes 'less' to not clear the screen after 
quit. I think both options are generally useful for terminal applications.

They are in particular useful for Git as it runs all output through a
pager. Git will run 'less' with '-FRX' by default if the environment 
variable $LESS is not defined [1]. Since oh-my-zsh used to set $LESS to 
'-R', Git would not override this setting. Consequently, Git would 
display even a single line of output in a pager and the user would need
to explicitly quit that pager (see mailing list discussion [2]).

Therefore, lets change the oh-my-zsh default value for $LESS to '-FRX'.
This would be useful for oh-my-zsh Git users and likely for users of
other applications that use 'less' too.

[1] https://github.com/git/git/blob/36438dc19dd2a305dddebd44bf7a65f1a220075b/Documentation/config.txt#L819-L821
[2] https://public-inbox.org/git/2412A603-4382-4AF5-97D0-D16D5FAAFE28@eluvio.com/

Sourcing oh-my-zsh happens in zshrc, which will override settings of
profile and zshenv.  Treat misc values, `PAGER` and `LESS`, as default
settings without overriding existing values.

Fixes: #1, robbyrussell/oh-my-zsh#3016

A bracketed-paste-magic bug breaks pasting of CJK and some other characters in zsh 5.1.1.
http://www.zsh.org/mla/workers/2015/msg02680.html
See #4434

Redirect STDERR along with STDOUT when looking for ack-grep

Incompatibilites between 5.0.8 and 5.1:
bracketed-paste-magic may also be necessary in order to apply url-quote-magic.

Reference: 
https://github.com/zsh-users/zsh/blob/a9df6aaa702abf761b155cd842a7f6917be44139/Functions/Zle/url-quote-magic#L11

Partially fixes #3614

LANG is a colon-separated list of prefered locales; LC_CTYPE is single entry,
therefore we need to remove all but one entry.

Also, there is no need setting it if it is already set (LC_ALL also sets
LC_CTYPE, so we check it too).

There were only three aliases left in aliases.zsh
File deleted!

This means we are running it after $PATH has potentially been set up,
which means it's more likely that commands like "git" will be found