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Close #3627

This change enables UP-arrow and DOWN-arrow full-line history completion.
For example, if you write `git clone` and press UP:

- Before this change,
  it will use the last command that starts with `git`.

- After this change,
  it will use the last command that starts with `git clone`.

znt: faster startup of tools using colorifying (e.g. n-history), optimized heap usage for older Zsh's

Make spectrum_ls implementation consistent with $FG and spectrum_bls

Close #4193

This avoids an ordering dependency between this and the vi-mode plugin.

Hide spectrum.zsh var values to avoid junky output to terminal

The alias was removed in #3564. A couple of users were using
it, so I'm adding it back.

common-aliases: handle "dev" versions in version check

Recognize Firefox addon and Android packages.

Use actual `commit --amend` command for Mercurial

Uses `is-at-least` instead of a numeric comparison hack, so versions with non-numeric bits like "4.5.0-dev5" don't throw errors.

Add Ecosia to web-search plugin.

The tilde character is not expanded when inside quotes. See https://github.com/robbyrussell/oh-my-zsh/issues/4668#issuecomment-162213379

Make code in lib/termsupport.zsh more readable

znt: updated README.md, twice as fast searching

Close #2739

Add support for "putty" $TERM in termsupport.zsh

[tmux-cssh plugin] Initial version

Fixes #4597

Otherwise `start` will confuse the first parameter as the title of
a new command prompt if the parameter contains whitespace. That is
because the command to be run will be:

    start "abc def"

which opens a new command prompt window with the title "abc def".
With the added empty string we force the start command to interpret
the passed parameter as the file / command:

    start "" "abc def"

which will be interpreted like `""` is the title and the rest is
the file or command to start.

-------

**NOTE:** this wouldn't be necessary if the start script in msys
was defined differently; that is, if it had the empty string
already incorporated in the script (/usr/bin/start), like so:

```diff
-cmd //c start "${@//&/^&}"
+cmd //c start "" "${@//&/^&}"
```

Notice however that this would make it impossible to use start
setting a different title, so it's probably best to leave it as is.

More info: http://sourceforge.net/p/msys2/tickets/14/

-------

The change `${(z)open_cmd}` is necessary to force zsh to split the
variable by the spaces and interpret it as separate words.

More info: http://zsh.sourceforge.net/FAQ/zshfaq03.html#l17

Added an option for the msys value of $OSTYPE

znt: n-history supports multi-line cmds and starts with current buffer
Fixes #4648