Use the `occur-target` text property to keep track of the extents of
all matches on each line instead of just the start of the first match.
Doing so allows us to highlight all matches when jumping to a matching
line instead of just the first one, and it works in a more principled
way.  It also removes compatibility problems that were introduced with
occur-highlight-regexp.

For compatibility with code that populate their own occur-mode
buffers, we still accept `occur-target` properties with a single
marker as value.

* lisp/replace.el (occur-highlight-regexp, occur-highlight-overlay):
Remove.
(occur-highlight-overlays): New.
(occur--targets-start): New.
* lisp/replace.el (occur-after-change-function):
(occur-mode-find-occurrence): Replace with...
(occur-mode--find-occurrences): ...this function that returns the
whole `occur-target` property value.
(occur-mode-goto-occurrence, occur-mode-goto-occurrence-other-window)
(occur-goto-locus-delete-o, occur-mode-display-occurrence)
(occur-engine): Adjust to new property format.
(occur--highlight-occurrence): Replace with...
(occur--highlight-occurrences): ...this function that takes
the `occur-target` property value as argument.
(occur-1): Don't use `occur-highlight-regexp`.
* test/lisp/replace-tests.el (occur-highlight-occurrence):
Adapt to new property format.

* test/lisp/replace-tests.el (replace-tests-with-undo):
When testing the "U" (undo all changes) option, the code will delay
and ding which is obnoxious in an automated test.
Disabling that makes the test quiet and about 150 times faster.

* lisp/replace.el (how-many): Count zero-length matches correctly
(bug#27359).

* test/lisp/replace-tests.el (replace-regexp-bug45973): Add test
(bug#45973).

Run "TZ=UTC0 admin/update-copyright".

Make the navigation in the occur buffer closer
to the navigation in the compilation buffer.

Add bindings to navigate the occur matches (Bug#39121).
Honor `next-error-highlight' and `next-error-highlight-no-select'
when navigating the occurrences.

* lisp/replace.el (occur-highlight-regexp, occur-highlight-overlay):
New variables.
(occur-1): Set `occur-highlight-regexp' to the searched regexp.
(occur-goto-locus-delete-o, occur--highlight-occurrence): New defuns.
(occur-mode-display-occurrence, occur-mode-goto-occurrence):
Use `occur--highlight-occurrence'.
(occur-mode-map): Bind n to `next-error-no-select'
and p to `previous-error-no-select'

* etc/NEWS (Changes in Specialized Modes and Packages in Emacs 28.1):
Announce this change.

* test/lisp/replace-tests.el (replace-tests-with-highlighted-occurrence):
Add helper macro.
(occur-highlight-occurrence): Add test.

* test/lisp/comint-tests.el:
* test/lisp/custom-resources/custom--test-theme.el:
* test/lisp/dabbrev-tests.el:
* test/lisp/emulation/viper-tests.el:
* test/lisp/erc/erc-track-tests.el:
* test/lisp/gnus/gnus-tests.el:
* test/lisp/imenu-tests.el:
* test/lisp/info-xref-tests.el:
* test/lisp/jit-lock-tests.el:
* test/lisp/json-tests.el:
* test/lisp/man-tests.el:
* test/lisp/replace-tests.el:
* test/lisp/shadowfile-tests.el:
* test/lisp/subr-tests.el:
* test/lisp/thingatpt-tests.el:
* test/lisp/xml-tests.el: Use lexical-binding.

* test/lisp/man-tests.el (man-tests-filter-strings):
* test/lisp/shadowfile-tests.el (shadow-test00-clusters)
(shadow-test01-sites, shadow-test06-literal-groups)
(shadow-test07-regexp-groups, shadow-test09-shadow-copy-files):
Silence byte-compiler.

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

30c4f35 (origin/emacs-26) query-replace-regexp undo: Update next-repl...
c596be0 Amend the menu caption for page "Display Property" in the Eli...
13b9510 Add description of chinese-sisheng

* lisp/replace.el (perform-replace):
Rename the local binding to not shadow next-replacement.
Update next-replacement after undo (Bug#37287).

* test/lisp/replace-tests.el (query-replace-undo-bug37287): Add test.
(query-replace-undo-bug37073): Tweak this test.