Fixes #681.

Fixes #679

Useful in piping Travis CI output through tap-filter manually.

Suggested-by: Matthew Martin
(in e2e97dde9c (r36941988))

See https://svnweb.freebsd.org/ports?revision=501751&view=revision

Has room for improvement; for now, I use it with CTRL-W_f.

Vim doesn't honour the modelines by default because they're too far from
the start/end of the file [the default value of the 'modelines' (sic)
option is too small].

Fixes #673.

See discussion on #664.

We cannot now for sure whether the flag is misspelled or simply unknown to us,
so err on the side of caution.  This fixes an unreleased regression.  Fixes #658.

Issue #641 was originally filed about this problem, but is left open to track
further enhancements.

Issue #202 is too overloaded.

$last_alias isn't needed; there's no reason to treat loops of length 2
(alias a=b b=a) differently to loops of length 1 (alias a=a), length 3
(alias a=b b=c c=a), or length N.

The «(( $+seen_alias[$arg] ))» check is redundant as of the last commit:
the enclosing condition ensures that $res is "alias", which implies that
«(( $+seen_alias[$arg] ))» is false.

occurred on zsh-5.0.7 and older but I don't have zsh-5.0.7 handy to test
on.)

Evidently, the issue was due to elision.

This addresses #665.0 and #665.5.

Fixes #656.
Fixes #660.

Regression from commit e1ecf950e23471b235e318ba7b85e77395a6b146,
"main: Do path expanstion after alias expansion" (sic).

Now every instance of «:foo:» is ''-quoted.  This enables $EDITOR to highlight
them consistently throughout the file.

Inspired by ab1013ae0d.

tee(1) truncated $fname.  Fortunately, the data that got truncated had just
been `git add`-ed, so no harm was done.

Also add tests.

'time' is a regression from 6647e88606
(last Wednesday).

Fixes second issue filed under #617
https://github.com/zsh-users/zsh-syntax-highlighting/issues/617#issuecomment-551253422

In the case of a command substitution in an alias, $arg[i,end_pos] would
not pass to the end of $arg and i <= start_pos - end_pos would not
iterate over all of $arg. Use $arg[i,-1] and $#arg respectively to avoid
issues in aliases.