Credentials cached in 'url-basic-auth-storage' are keyed by
"server:port", but were being looked up by just "server" in
'url-basic-auth'.
* lisp/url/url-auth.el (url-basic-auth): Lookup cached basic auth
credentials by "server:port".  (Bug#79486)

* test/lisp/url/url-auth-tests.el (url-auth-test-auth-retrieve-cache):
Check the digest auth test-cases cache retrieval test cases against the
basic auth logic.

When building a query string via `url-build-query-string',
%-encode literal % characters appearing in both the keys and
the values.
* lisp/url/url-util.el (url--query-key-value-preserved-chars):
Define a new constant based on `url-query-key-value-allowed-chars'
specifying the characters that should be preserved when %-encoding
query-string keys and values.
(url-build-query-string): Use the new constant (fixes Bug#78984).

* test/lisp/url/url-util-tests.el (url-util-tests): Add a test.

* test/lisp/url/url-parse-tests.el
(url-generic-parse-url/ms-windows-file-uri-handling): Rename.

* lisp/url/url-parse.el (url-recreate-url): Handle empty filenames
without errors.

* test/lisp/url/url-parse-tests.el
(url-generic-parse-url/ms-windows-file-uri-hanlding): Add one
more test for the scenario above.

* test/lisp/url/url-parse-tests.el
(url-generic-parse-url/ms-windows-file-uri-hanlding): Reformat and
fix the test on MS-Windows.

* lisp/url/url-parse.el (url-generic-parse-url): Remove prefix /
when a file URI's filename starts with a single letter followed
by a colon and a slash or backslash.
(url-recreate-url): Mirror the change applied when parsing, so
the URL is recreated properly on MS-Windows.
* test/lisp/url/url-parse-tests.el
(url-generic-parse-url/ms-windows-file-uri-hanlding): New test.
(Bug#76982)

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

* lisp/url/url-util.el (url-query-key-value-allowed-chars):
New defconst.
(url-build-query-string): Use it to escape only those
characters that need it in keys and values.
* test/lisp/url/url-util-tests.el (url-util-tests): Add
new test cases.  (Bug#70312)