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This reverts commit cbd6fbe7.

Fixes #8949

Fixes #8722

`jobs %string` doesn't work correctly when run inside `$()`. `$jobstates` and
`$jobtexts` is available in the current shell process, so even though we need
to replicate a bit more logic, every type of `fg` invocation works correctly.

Fixes #8693

- Move grep-alias path to variable.
- Use <<< "" instead of piped echo to check grep flags.
- Remove check for --color only since it's the same release as --exclude.

This version tries whether grep supports all the flags together
and progressively checks older flags if the grep test fails.
This means only one grep call if all flags are supported, and
one additional call for every flag that's not supported, up to
a maximum of 3 calls.

- Use $ZSH_CACHE_DIR to store the grep alias with all the right features
- Expire the cache after 24 hours
- See issue #8444

Apple's Terminal doesn't open a new tab in your current directory if your hostname has UTF-8 characters in it. Percent encoding the host in addition to the path in update_terminalapp_cwd appears to solve this issue.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Source: https://github.com/microsoft/WSL/issues/4852#issuecomment-579616808

Closes #6243

Provides a different solution to #8332 and #8333

Fixes #8614

Closes #4989
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Use add-zsh-hook to add functions to hooks. That way they won't be added again
when doing `source ~/.zshrc` multiple times.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

$GIT_STATUS_IGNORE_SUBMODULES can be used to specify handling of
submodules. It can be:
not set : ignore dirty submodules (this was default zsh behavior)
"git"   : do not use "--ignore-submodules" and let git choose,
          this obeys setting in .gitmodules
other   : comes into "--ignore-submodules=$GIT_STATUS_IGNORE_SUBMODULES"

WSL 2 changes the output of `uname -r`. For instance,

  WSL 1: 4.4.0-18980-Microsoft
  WSL 2: 4.19.67-microsoft-standard

Since WSL 2 lowercases the M, we can match for the rest of the string
which remains lowercase throughout both versions. Another option would
be to match for both upper- and lower-case Ms, like that:

  $(uname -r) = *[Mm]icrosoft*

Fixed use of nohup in open_command where it was only necessary for
xdg-open (and actually harmful for cmd.exe in WSL 2). The current logic
is simpler and more future-proof.

Fixes #7942

Tmux must have special handling for /dev/stdin since it's managing the
terminal itself. This was tested with tmux-2.9a on macOS.

This implements essentially the same heuristic as neovim, with the additional
(existing) special support for Cygwin.
See: https://github.com/neovim/neovim/blob/e682d799fa3cf2e80a02d00c6ea874599d58f0e7/runtime/autoload/provider/clipboard.vim#L55-L121
  - pbcopy, pbpaste (macOS)
  - cygwin (Windows running Cygwin)
  - wl-copy, wl-paste (if $WAYLAND_DISPLAY is set)
  - xclip (if $DISPLAY is set)
  - xsel (if $DISPLAY is set)
  - lemonade (for SSH) https://github.com/pocke/lemonade
  - doitclient (for SSH) http://www.chiark.greenend.org.uk/~sgtatham/doit/
  - win32yank (Windows)
  - tmux (if $TMUX is set)

Previously, OS detection would happen on each invocation. This makes it
happen once (unless it fails, in which case it will try again on the
next invocation).

This has the additional benefit of localizing the platform-specific
checks and commands, too, versus spreading them out in separate
functions.

Ideally the parameter would just be removed-users could always
just do "clipcopy < some-file". but removing the parameter would break
backwards compatibility.

In any case, this simplifies the logic considerably.