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

* test/lisp/dabbrev-tests.el (dabbrev-expand-after-killing-buffer):
In batch runs of this file, the user-error message contains curved
quotes, but grave quotes when running `make check' (so here was
evidently not passed to `substitute-command-keys'), so use grave
quotes so the test succeeds in both modes of execution.

* test/lisp/dabbrev-tests.el (dabbrev-expand-after-killing-buffer):
Fix typo in a 'should' test, use part of return value of 'should-error'
test, and remove mistaken and unfounded FIXME comment.

* lisp/dabbrev.el (dabbrev-expand): Use the buffer where the last
expansion was found only if it is still a live buffer (bug#74090).

* test/lisp/dabbrev-tests.el (dabbrev-expand-test-minibuffer-3):
Fix typo in doc string.
(dabbrev-expand-after-killing-buffer): New test.

* lisp/dabbrev.el (dabbrev-expand): Use the buffer where the
expansion was found when setting the internal variables used to
determine the next expansion or a replacement expansion.

* test/lisp/dabbrev-tests.el (ert-x): Require for
'ert-with-temp-directory', 'ert-resource-directory' and
'ert-resource-file'.
(with-dabbrev-test): New macro.
(dabbrev-expand-test-same-buffer-{1,2,3,4})
(dabbrev-expand-test-other-buffer-{1,2,3,4})
(dabbrev-expand-test-minibuffer-{1,2,3,4}): New tests.

* test/lisp/dabbrev-resources/dabbrev-expand.el:
* test/lisp/dabbrev-resources/INSTALL_BEGIN: New test resources.

(cherry picked from commit f6c359cb66a0e9b851e3467b1ba9cab7efa8f744)

(dabbrev-expand-test, dabbrev-completion-test)
(dabbrev-completion-test-with-argument):
Use 'kbd' to format keys for 'execute-kbd-macro'.
(dabbrev-expand-test): Fix docstring.