Work around <https://github.com/chrisbra/vim-zsh/issues/33>.

* changelog.md: Update links here too.  They have not yet appeared in
    any stable release.

Command used: perl -pi -e 's#http://zsh.sourceforge.net#https://zsh.sourceforge.io#g' **/*(.)

5.8.0.3 was correct until 5.8.1 was released (see the great-grandparent of this
commit, "driver: Bump the in-development is-at-least checks so they return
false on zsh 5.8.1, released yesterday").

5.2 -> 5.3 is simply a typo fix.  zle-line-pre-redraw has been available since then.

Patch by Nuri Jung; extension to cover PCRE by me.  See #747.

Fixes #747.

Fixes #856
Fixes #857

Part of PR #832.

Closes #687, #818.

PR #776 fixed an issue with complex aliases and expansion. However, this change
also introduced a problem with aliases which contain `]` (for example, commonly
seen on macOS: `alias ]=open`), due to using an associative array `seen_alias`,
indexed by the alias name. Due to `"$seen_alias[$arg]"`, it would fail when
`$arg` is expanded to anything containing `]`'. Thus, typing `] /` would result
in:

```
> ] /
(anon):unset:3: seen_alias[]]: invalid parameter name
```

This change fixes the issue by ensuring we properly access keys in the
associative array `seen_alias`.

Older versions of zsh have issues with map keys having special
characters, especially lacking ways to remove such keys. The
issue is described in detail in
https://unix.stackexchange.com/questions/626393/in-zsh-how-do-i-unset-an-arbitrary-associative-array-element.

This fix uses proposal from
[zsh-workers/43269](https://www.zsh.org/mla/workers/2018/msg01073.html),
discovered by Stephane Chazelas, that boils down to avoid removing keys
from the map, and reconstruct the map anew with some keys omitted.

Co-authored-by: @phy1729

Fixes #797.

Fixes #775.

No functional change. Keeps track of how deep we are in expanding nested
aliases for the next commit.

Signed-off-by: Hussaina Begum Nandyala <hexxdump@gmail.com>

Fixes #769

This reverts commit 62c5575848.

The test fails when zsh/parameter is available.

See comments within for the rationale.

This is a regression test for a regression that was only present in development
versions of PR #764 and was never present in master.

Reported on issue #757 along with other issues.

E.g., on Cygwin /etc/passwd does not necessarily exist.

The bug is as follows:

    % zsh-5.8 -fc 'autoload is-at-least; is-at-least 5.8.0.2 && echo yes || echo no'
    yes
    % zsh-5.8 -fc 'autoload is-at-least; is-at-least 5.8.0.2 $ZSH_VERSION && echo yes || echo no'
    yes

This commit deploys the following workaround:

    % zsh-5.8 -fc 'autoload is-at-least; is-at-least 5.8.0.2 $ZSH_VERSION.0.0 && echo yes || echo no'
    no

Fixes #756.

The parent commit, which merged the feature/redrawhook bug and thereby
closed PR #749, also fixed the following issue:

Fixes #40.

Fixes #90, closes #470. (The latter is a PR for the former.)

Fixes #150, closes #151, closes #160. (The latter two are PR's for the first one.) The related issue #183 appears to have been fixed in master. For #150, a different fix for older versions of zsh was considered but has not been implemented.

Issue #154 was fixed in xsel(1) in 2017. The parent commit probably fixed that issue for pre-2017 xsel(1).

Is #245, #356, and #749. Fixes #245 (redrawhook umbrella issue).

Does not reintroduce #257 (comment).

Does not reintroduce #259 (comment)

Closes #281 as obsolete.

Fixes #295.

Fixes #324.

Fixes #375.

Fixes #377.

Closes #421 as obsolete.

Fixes #520.

Unblocks #536 (already milestoned).

Fixes #632.

Unblocks #635. Milestoned.

Unblocks #688. Milestoned.

Unblocks administrative issue #655 (already milestoned).

(The above is copied from
https://github.com/zsh-users/zsh-syntax-highlighting/pull/749#issuecomment-658407330,
but repeated here for the sake of github's commit-to-issue linking magic.)

* feature/redrawhook:
  docs: Track making the new codepath conditional upon the 'memo=' feature.
  On the feature/redrawhook branch, changelog: Add entries for issues fixed by this branch.
  On the feature/redrawhook branch, change the detection of the 'memo=' feature to avoid a catch-22.
  driver: Make the redrawhook codepath conditional upon the memo= feature.
  On the feature/redrawhook branch, move the changelog entry to the current release's section.
  driver: Fix a bug that prevented subsequent, third-party zle-line-pre-redraw hooks from running.
  driver: Do not pass widget arguments to _zsh_highlight
  driver: Clarify comment.  No functional change.
  driver: Allow for -U in autoloaded function definition
  driver: Use idiomatic module check
  driver: Make the shadowing $WIDGET read only.
  driver: Avoid a fork in the common case.
  test harness: Actually test the new code.
  driver: Rewrite without a state variable
  noop: Make a whitespace-only change to reduce noise in the next commit.
  docs: Rewrap.
  docs: Update FAQ answer per changes on this branch.
  redo _zsh_highlight__function_callable_p
  driver: Use a different way of checking whether add-zle-hook-widget is present.
  changelog: Use a more specific link.
  changelog: Note the effect of fixing #245/#90 and an alternative.
  driver: Pass zle-line-finish arguments on to _zsh_highlight.
  driver: Hook zle-line-finish.
  driver: Reimplement using 'add-zle-hook-widget zle-line-pre-redraw'
  wrappers: Reimplement using Mikachu's zle-line-pre-redraw hook (workers/36650).

The new codepath is used in 5.8.0.2 and newer; see zsh-syntax-highlighting.zsh:417.

This covers issues referenced from #245 or labelled "feature:redrawhook" or "widget-wrapping".  See #749 for details.

* origin/master:
  Post-release version number bump.
  Tag version 0.8.0-alpha1-pre-redrawhook.
  brackets: Optimize the character iteration

Test case: See the first comment of issue #295.

Before:
num  calls                time                       self            name
-----------------------------------------------------------------------------------
 1)   14         284.67    20.33   82.84%    284.67    20.33   82.84%  _zsh_highlight_highlighter_brackets_paint
 2)   15         313.72    20.91   91.30%     26.62     1.77    7.75%  _zsh_highlight
 3)   14         318.68    22.76   92.74%      7.41     0.53    2.16%  _zsh_highlight_call_widget

After:
num  calls                time                       self            name
-----------------------------------------------------------------------------------
 1)   15          57.25     3.82   45.33%     28.30     1.89   22.41%  _zsh_highlight
 2)   14          81.96     5.85   64.90%     27.02     1.93   21.40%  _zsh_highlight_call_widget
 3)   14          26.31     1.88   20.84%     26.31     1.88   20.84%  _zsh_highlight_highlighter_brackets_paint
 4)    2          10.66     5.33    8.44%      8.97     4.49    7.10%  VCS_INFO_formats
 5)    2          25.92    12.96   20.52%      7.72     3.86    6.11%  VCS_INFO_get_data_git

(That's not in my everyday configuration but in my minimal testing
setup, which runs vcs_info with the default settings.)

* origin/master:
  Revert "driver: Move the initialization of $zsh_highlight__memo_feature out of the entry point function."

This reverts commit 8a1bd7c8b6.

The detection only works correctly from a widget function, so the change
was wrong: it caused zsh_highlight__memo_feature to be set to false
every time.