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.

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

Notably, the 'single-hyphen-option' and 'assign' contexts both default to the
'none' style, so before this patch, the tests would not have detected a failure
to apply those two contexts.

For other contexts, using $unused_highlight only helps detect the case where
the right highlight style (e.g., 'fg=yellow') is used as a result of applying
the wrong context — which should be a theoretical failure mode.

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

Have widgets return EXIT_SUCCESS.

In region_highlight, a spec of the form 'i j foo' with i >= j should have no effect.
Before this commit, however, the {$i..$j} range would happily expand to (5 4 3)
if i > j were the case (e.g., i=5 and j=3).

This breaks vanilla-newline.zsh; the next commit will fix that.

This way, each test can set custom styles to specific highlight contexts
(to differentiate those contexts) without affecting later tests.

Otherwise, *.rej patch files would be run by zsh, with unpredictable results.

Fixes zsh-users/zsh-syntax-highlighting#165.
Fixes zsh-users/zsh-syntax-highlighting#175.

* danielsh/i165-region-v1:
  Highlight yanks/pastes on top of syntax highlighting.
  Highlight the region on top of syntax highlighting.

The path string ends at offset 26, not 23.

Fixes zsh-users/zsh-syntax-highlighting#195.

The one revision made on master between this branch's creation and merge
already uses correct offsets.

* danielsh/i195-tests-offbyone-v1:
  New test for dollar-double-quoted-argument.
  test harness: Fix off-by-one discrepancy between observed and expected.

This exercises the previous patch.

Fixes issue #195.

This does not yet highlight backslash escapes within them.

Let $zle_highlight[paste] override $region_highlight.

Let $zle_highlight[region] override $region_highlight.

Add an underline, since they are at command word position but will be executed
by something else.

Suggested-by: Daniel Hahler

Fixes zsh-users/zsh-syntax-highlighting#189.

Fixes zsh-users/zsh-syntax-highlighting#94.

Fixes zsh-users/zsh-syntax-highlighting#94.