Fixes #681.

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

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.

Also add tests.

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

Current output:
.
    # precommand-then-assignment
    1..4
    ok 1 - [1,4] «nice»
    not ok 2 - [6,8] «x=y» - expected (6 8 "unknown-token"), observed (6 8 "assign"). # TODO "issue #641.5"
    not ok 3 - [8,8] «y» - expected (10 11 "default"), observed (8 8 "default"). # TODO "issue #641.5 (fallout)"
    ok 4 - cardinality check # SKIP cardinality check disabled whilst regular test points are expected to fail

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.

Suggested by Daniel.

Fixes #565 and #576

sudo -e does not take a command, so use another flag that does.

Should fix #624

The test point is XPASSing, which makes CI red.  As a duct tape measure to turn
CI green again, update the test expectations to make it XFAIL.  The hacky part
is that the expectation set by this commit will never be met; the test point
will never XPASS now until its expectations are changed again.

Issue #623 remains open to track setting the test expectation to the correct
value (i.e., make the test XFAIL in a manner that _will_ XPASS if the bug is
fixed; in other words, pay off the technical debt created by this commit).

Issue #616 remains open to fix the actual bug.

Regression test included.

Fixes #578.

Review-by: Matthew Martin

Closes #548

stdbuf is not present on all systems. nice is not builtin and is POSIX.