The latest version of zplug has deprecated the `nice` tag. The `defer` tag is the preferred method now.

Merge remote-tracking branch 'upstream/pr/395'

* upstream/pr/395:
  tests: Add a regression test for issue #392 (aliases beginning with a '+' are lost).
  tests: Move some code in preparation for next commit. No functional change.
  driver: Don't undefine aliases that begin with a '+', to workaround an upstream bug.

Fixes #392.

The upstream repository has been split and renamed.

Fixes #391.

Fixes #390.

Merge remote-tracking branch 'upstream/pr/385'

* upstream/pr/385:
  'main': Add regression test for previous commit.
  'main': Fix bug: no start_pos=$end_pos in comment short path

Fixes #385.

Such a command word would, if not valid, fall through to the `type -w` case,
where the output would be misparsed, consequently the forward-compatible [arg0]
style would be used.

Also remove the existing image, thereby removing the filename expansion
example and the file-existence highlighting example.

- Move an entry to another section.
- Fix commit hash width.
- Add missing punctuation.

That revision was itself a followup to 51614ca2c9.

Fixes #316.

* danielsh/i316-v2:
  'main': Enable fallback to the 'arg0' style.
  'main': Set fallback style for the 'arg0' style.

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

'arg0' was previously known as 'commandtypefromthefuture'.

* upstream/pr/374:
  'main': Directly count spaces to skip, don't leverage proc_buf length

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.