Suggested-by: Ory Band
(on issue #169)

This causes '~/bin/foo' to highlight as a command, rather than as a file.

Part of issue #201.

Fixes zsh-users/zsh-syntax-highlighting#193.

Fixes zsh-users/zsh-syntax-highlighting#147.

Fixes zsh-users/zsh-syntax-highlighting#188 in the case that both the
opening '((' and closing '))' have been typed,  The case that only the
opening '((' have been typed is also fixed, but requires a zsh development
build (zsh-5.1.1-52-g4bed2cf or newer); see comments within.

Fixes zsh-users/zsh-syntax-highlighting#193.

Followup to 219184f046d40cc723606797666dab18f8a6aea7, which fixed issue #196.

Related to issue #205.

Without this, redirections, history expansions, and command separators would
be matched by path_approx.

A test case is simply LBUFFER="<" RBUFFER="" (highlighted as redirection with this
fix and as path_approx without it).

Fixes zsh-users/zsh-syntax-highlighting#204.

Fixes zsh-users/zsh-syntax-highlighting#23.

* danielsh/i23-highlight-redirections:
  Highlight redirections.

Remove highlighting of hex and octal escapes in "" strings (which don't parse
those escapes), add it to $'' strings (which do), and correct the regexps.
Also add support for unicode \u/\U escapes.

Fixes zsh-users/zsh-syntax-highlighting#196.

* danielsh/i196-back-dollar-quoted-v1:
  back-dollar-quoted-argument: Correct an off-by-one.
  back-dollar-quoted-argument: Correct octal escape syntax.
  back-dollar-quoted-argument: Highlight \uHHHH and \UHHHHHHHH escapes.
  back-dollar-quoted-argument: Don't consider \0xHH a hex escape sequence.
  back-dollar-quoted-argument: Don't consider comma a hex character.
  Highlight backslash escapes within $'' strings.

Highlight the last character of a «\xHH» escape when it is the last thing in
LBUFFER.  This is similar to what b0cc02ed86 did
for issue #186.

A leading zero, as in '\0NNN', is permitted by 'echo' but not by 'print',
and «$''» follows 'print'.

A leading zero is not permitted in the '\xHH' syntax.

Character class syntax does not ignore commas between ranges.

Correct highlighting of backslash escapes within "" strings: highlight only
the four specific escape sequences defined there.

Fixes zsh-users/zsh-syntax-highlighting#196.

Found by code inspection; WARN_CREATE_GLOBAL missed this.

Follow-up to 908c4fe150.

Intended to fix fix zsh-users/zsh-syntax-highlighting#206.

See issue #137.  A reproduction recipe for testing this change:

$ zsh -f
% bindkey -e
% source <the script from http://www.zsh.org/mla/users/2014/msg00321.html users/18584>
% source zsh-syntax-highlighting.zsh
% echo foo
% echo bar
% <^R>echo<^R>

This finds the 'echo foo' with this change but not without it.

Followup to 908c4fe150.
Found by test-perfs.zsh.

Fixes zsh-users/zsh-syntax-highlighting#23.

Thanks to tibbs@fedora for setting up anitya.

* danielsh/i186-dollar-dquote:
  dollar-double-quoted-argument: Handle «"foo$"» correctly.
  dollar-double-quoted-argument: Highlight "$foo" better.

Now, «"$42foo"» doesn't highlight the «foo», and «"$bar» highlights the «r».

Fixes zsh-users/zsh-syntax-highlighting#185.

Set WARN_CREATE_GLOBAL to prevent recurrence.

Fixes zsh-users/zsh-syntax-highlighting#192.

This is part of issue zsh-users/zsh-syntax-highlighting#198.

* highlighters/main/test-data/hashed-command.zsh:
    Set the right region key.  This makes the test more specific.
    (Issue #184 would have caught this bug.)

This is part of issue zsh-users/zsh-syntax-highlighting#198.

* danielsh/i199-semicolon-v1:
  Fix regression: Highlight ';' as commandseparator.
  Follow-up to 547b8be30461: Fix $observed_result calculation.

Fixes zsh-syntax-highlghting/zsh-users#199.

This was broken by c2b9327b07
and tracked as zsh-users/zsh-syntax-highlighting#199.

This fixes the vanilla-newline.zsh test, which was was (consciously) broken
by the previous commit.

This is part of issue zsh-users/zsh-syntax-highlighting#198.

This is part of issue zsh-users/zsh-syntax-highlighting#198.

This is part of issue zsh-users/zsh-syntax-highlighting#198.

This is part of issue zsh-users/zsh-syntax-highlighting#198.