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Fixes #9326

Related: #2537, #9324

This makes it work regardless of where nvm is loaded from. And it uses nvm's
version strings, which distinguish the "system" and "none" NVM environments,
instead of reporting the specific version of the system node.js or erroring,
respectively.

Fixes #4336
Closes #4338

- Add plugin and theme subcommand

  Fixes #8961

- Add confirmation prompt to `omz pr clean` command

- Correct behavior on invalid answers on confirmation prompts

  If an invalid option is supplied, don't proceed with the potentially
  destructive action.
Co-authored-by: Rishabh Bohra <rishabhbohra01@gmail.com>

- Fix 'STASHED' key and unsupported syntax in 5.0.2
- Optimise `if` statement to make it more idiomatic.

Closes #4912
Closes #5137
Closes #8071

In Ubuntu and Debian, in scp, and in rsync the prompt is by default specified as in

  user@hostname:/path/to/directory

while the previous title in ohmyzsh was

  user@hostname: /path/to/directory

Fixes #9295

Fixes #8743

It conflicts with normal Backspace behavior. Fixes #9155

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Fixes #9050

Fixes #7609
Closes #8191
Co-authored-by: Michal Grňo <m93a.cz@gmail.com>

Fixes #8468

Closes #8342

Co-authored-by: Peter J. Schroeder <peterjschroeder@gmail.com>

See https://github.com/ohmyzsh/ohmyzsh/pull/8807#issuecomment-652697704

DISABLE_UNTRACKED_FILES_DIRTY, DISABLE_AUTO_TITLE, GIT_STATUS_IGNORE_SUBMODULES are not set
Handle these variables not being set with conditional access.

If the user has set -u option to report attempts to use undeclared / unassigned variable, accessing the variables needs to be conditional.

oh-my-zsh Changes the HISTSIZE and SAVEHIST values to fixed sizes,
however if a bigger value is set in ~/.zshrc, it will override it,
potentially causing the user history to be deleted.

So, only set these values if no other is set and if it is lower than the
default ones.

This reverts commit cbd6fbe7.

Fixes #8949

Fixes #8722