* lisp/image/gravatar.el (gravatar--service-libravatar): Don't error
when failing to parse email address, just return the default URL.
* test/lisp/image/gravatar-tests.el (gravatar-build-url): Adjust
for new default gravatar url.
* lisp/image/exif.el (exif--direct-ascii-value): New function
(bug#40127).
(exif--parse-directory): Use it to get the correct values for
in-directory (i.e., shorter than 4 octets) strings.
For discussion, see the following thread:
https://lists.gnu.org/archive/html/emacs-devel/2019-07/msg00528.html
* etc/NEWS: Announce changes in gravatar.el user options.
* lisp/image/gravatar.el (gravatar-cache-ttl): Change :type to
number of seconds without changing the default value and while still
accepting other timestamp formats.
(gravatar-rating): Restrict :type to ratings recognized by Gravatar.
(gravatar-size): Allow nil as a value, in which case Gravatar's
default size is used.
(gravatar-default-image, gravatar-force-default): New user options
controlling the Gravatar query parameters 'default' and
'forcedefault', respectively.
(gravatar-base-url): Use HTTPS.
(gravatar--query-string): New helper function to facilitate testing.
(gravatar-build-url): Use it.
* test/lisp/image/gravatar-tests.el (gravatar-size)
(gravatar-default-image, gravatar-force-default)
(gravatar-build-url): New tests.
For discussion, see the following thread:
https://lists.gnu.org/archive/html/emacs-devel/2019-07/msg00528.html
* lisp/image/gravatar.el (gravatar-hash): Trim leading and trailing
whitespace in given address, as per the Gravatar docs.
(gravatar-retrieve-synchronously): Silence call to
url-retrieve-synchronously for consistency with gravatar-retrieve.
(gravatar-retrieved): Only cache buffer on successful retrieval.
* test/lisp/image/gravatar-tests.el: New file.
