Part of issue #645.

Part of issue #645.

Fixes #609.

We already declare $expected_region_highlight in run_test_internal().
Therefore, it will always be declared.

It was broken by commit e6eea1f9b7e67136911536a2450c7130f44c0b04,
"test harness: Don't leak options from test files to the test harness.".

See the last commit,
bdb4e8b70e test harness: When the cardinality check fails, pretty-print \$expected_region_highlight and \$region_highlight.

* danielsh/whitespace-historical:
  Fix historical instances of one-space indentation.

Fixes an issue whereby the '# TODO "issue #687"' directive in the output of
opt-shwordsplit1.zsh was truncated, because the test itself had set the
SH_WORD_SPLIT option and that affected the evaluation of
«${(z)expected_region_highlight[i]}» in the test harness.

Furthermore, this patch also independently fixes the error under
zsh-5.0.8 and earlier that was fixed by the previous commit.

The output of test-data/opt-shwordsplit1.zsh on zsh 5.7 is:
.
    1..2
    ## opt-shwordsplit1
    # BUFFER=vim
    not ok 1 - [1,7] «$EDITOR» - expected (1 7 "function"), observed (1 7 "unknown-token"). # TODO "issue
    ok 2 - cardinality check # SKIP cardinality check disabled whilst regular test points are expected to fail

On zsh 5.0.8, tap_escape() choked when called on the arguments argv=('[1,7]'
'«vim»').  This patch fixes that.

As you may have noticed, under zsh 5.7 the diagnostic message of test point 1
is truncated.  That'll be fixed in the next commit.

The escaped caret was taken for a negated character class.  This caused test-data/arith1.zsh
to XPass: the arithmetic expansion was consumed by the 'while' loop.

This is not perfect: we don't try to detect cases such as «$((ls); (ls))»,
which look like arithmetic expansions but are in fact command substitutions.

Fixes part of #607.

Introduces #704.

The cardinality check shall —

- if the test sets \$expected_mismatch, be XFail;
- elif any test points is XFail, be skipped;
- else, be expected to pass.

To test this, change «6 * 9» to «6 + 9» in test-data/arith1.zsh that
will be added in the after-next (grandchild) commit.

Fixes #694.

Fixes #583.

Fixes #582.

No functional change.

Fixes #630.

Fixes #676.

Computing ${#array} is O(N), whereas checking 0 is O(1).

* commit 'b1f36d9c5f45b879fbd2f64195167a60d9f3cb9e':
  'main': Add a comment.
  'main': Fix the $CDPATH from the previous commit.
  'main': Add a test for a $CDPATH bug.

Uses the infrastructure added in the previous commit.

Fixes #678.

This prevents the baz pattern match from being attempted whenever the
bar pattern match was tried and failed.

No functional change.

Before this commit, the test was unable to XPass, since there is no
highlighting style called "normal".

* danielsh/tests-skip-cardinality-v1:
  tests: Minor documentation readability tweak
  Add a test for issue #641.5, using the infrastructure added in the previous commits.
  tests: Skip cardinality tests whenever any test point is expected to fail.
  tests: Make $expected_mismatch skip the cardinality check, rather than consider it an expected failure.
  tests: Include the name of the 'cardinality check' test point in the output

Fixes #692.