This fixes tests broken in my last change, "Merge
diff-font-lock-refine and diff-auto-refine-mode into diff-refine" from
2019-02-24.
* test/lisp/vc/diff-mode-tests.el (diff-mode-test-font-lock):
Bind diff-refine to symbol 'font-lock' instead of binding
diff-font-lock-refine to t.
(diff-mode-test-font-lock-syntax-one-line): Bind diff-refine
to nil instead of binding diff-font-lock-refine to nil.
* lisp/tar-mode.el (tar--try-jka-compr): New function copied from
archive-try-jka-compr.
* lisp/arc-mode.el (archive-try-jka-compr): Set buffer-multibyte to t
instead of let-binding coding-system-for-read to 'no-conversion.
* test/data/decompress/tg.tar.gz:
* test/data/decompress/zg.zip: New fixtures.
* test/lisp/arc-mode-tests.el (arc-mode-test-zip-extract-gz):
* test/lisp/tar-mode-tests.el (tar-mode-test-tar-extract-gz): New tests.
* test/lisp/vc/diff-mode-tests.el (diff-mode-test-font-lock)
(diff-mode-test-font-lock-syntax-one-line): Skip unless shell and
diff executables are found.
(diff-mode-test-font-lock-syntax-one-line): New test for one line.
* test/data/vc/diff-mode/hello_world.c:
* test/data/vc/diff-mode/hello_world_1.c:
* test/data/vc/diff-mode/hello_emacs.c:
* test/data/vc/diff-mode/hello_emacs_1.c: New fixtures.
* lisp/vc/diff-mode.el (diff-syntax-fontify): Move remove-overlays
from diff-syntax-fontify-hunk. (Bug#33567)
(diff-syntax-fontify-hunk): Remove VISIT arg from insert-file-contents.
Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November. Change these FTP URLs to https://ftp.gnu.org
instead. Make similar changes for URLs to other organizations moving
away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.
