That revision was itself a followup to 51614ca2c9.

The fallback style name uses '_' in anticipation of a future auto-fallback
feature keyed on style names.

'arg0' was previously known as 'commandtypefromthefuture'.

Main highlighter run on itself, on the optimized version:

- optimized (8 runs, 3 last noted):
1.1201650000
1.1074430000
1.1263810000

- unoptimized (8 runs, 3 last noted):
1.5746400000
1.5115250000
1.5155440000

Average difference: 0.415907

Part of issue #139.

Fixes #344.

Fixes #96.

Running main highlighter on itself (both runs are on the optimized
version):

- clean (8 runs, last 3 noted):
1.7007670000
1.7330720000
1.7038810000

- optimized (8 runs, last 3 noted):
1.5007230000
1.5142960000
1.4973320000

Average difference: 0.208456

When parsing main-highlighter with itself, the *_check_path function is
called 426 times. Note that there are 686 region_highlight resulting
entries.

Fixes #335.

Fixes #333.

Fixes #368.

Fixes a subset of issue #237.

This is related to a future "unbalanced { ( ) }" check for issue #344.

Also adds an XFail test for balanced braces for issue #344.

This was suggested on #355.

This manifested in completion of the form «./foo<TAB>» where there happened to
be a program called 'foo' in $PATH.

Fixes #354.
Closes #355.

This tracks the API change made in the previous commit, as suggested in the
(#if 0'd) deprecation warning.

This is a prerequisite for the next commit.

The incumbent code was wrong: the test of $in_redirection in the first hunk
would never have seen «(( in_redirection == 2 ))».  That had no visible
effect since options to sudo don't look like redirection operators.

The structure now mirrors the stall construct at the top of the loop.

Special handling for cursor imprint or partial path highlighting
is needed in more cases than accept-*. For example when accepting
a line from isearch, no accept-* widget is invoked.

The proper way is to use zle-line-finish.

Trumps #259.
Fixes #284.

The test passes so I'm adding it directly to master.

Just in case one of the interpolated variables contains a backslash.

Fixes #342.

If the separator feature is disabled, this makes it possible to
change the main 'path' styles in a running session without the
need to touch the '_pathseparator' styles, too.

Causes such expansions to be highlighted as [unknown-token] rather than as default (absent from $region_highlight).

Fixes #337.

Part of #337.

Fixes #231.
Fixes #330.

Assignments to positional parameters using scalar assignment syntax is
a feature: it is covered by upstream's test suite ("append to positional
parameter" in Test/A06assign.ztst).

This commit is based on the work done by
Jorge Israel Peña (blaenk) in #136.

Changes:
* Adjusted to changes on the latest master branch.
* Use regular path highlighter colors by default.
* Break out early if the separator color is the same to
  improve performance.
* Tests.