* lisp/subr.el: (string-common-prefix): New function.

* etc/NEWS:
* doc/lispref/strings.texi:
* doc/lispref/minibuf.texi:
* lisp/emacs-lisp/shortdoc.el:
Documentation.

* etc/NEWS: Announce the new customization option (bug#80215).
* lisp/textmodes/yaml-ts-mode.el (yaml-ts-mode): New customization group.
(yaml-ts-mode-yamllint-options): New customization option.
(yaml-ts-mode--flymake-process): New variable that stores the reference
to the flymake process.
(yaml-ts-mode-flymake): New function that implements support for Flymake.

* lisp/progmodes/json-ts-mode.el (json-ts--get-path-at-node)
(json-ts--path-to-jq, json-ts--path-to-python): New functions.
(json-ts-jq-path-at-point): New command for getting JSON path at point.

* test/lisp/progmodes/json-ts-mode-tests.el: New file.
Add tests for the utility command.

* etc/NEWS: Announce new command 'json-ts-jq-path-at-point' (bug#80190).

The info returned from `garbage-collect` is really handy to
track the evolution of the heap size, but sadly it's available only
at the cost of running a full GC, which has two big downsides:
it's slow, it affects what we're measuring, and it can't be used
in `post-gc-hook`.
So, this patch makes it available without running the GC.

* src/alloc.c (Fgarbage_collect_heapsize): New function, extracted from
`Fgarbage_collect`.
(Fgarbage_collect): Use it.
(syms_of_alloc): defsubr it.

* doc/lispref/internals.texi (Garbage Collection): Extract
documentation for it from that of `garbage-collect`.

(split-tab): Alias for 'tab-bar-split-tab'.

* lisp/vc/diff-mode.el (diff-restrict-view): Disable it.
* etc/NEWS: Announce the change.

* lisp/textmodes/text-mode.el (center-line-mode--track-changes):
New local variable for storing the id of the change tracker registered
for the current buffer.
(center-line-mode--track-changes-signal): New function to be called by
the track-changes library whenever there is a change in the current
buffer.
(center-line-mode--track-changes-function): New function called from the
above signal function, iterates over the lines of the modified region,
calling 'center-line' for each non-empty line.
(center-line-mode): New minor mode.
* etc/NEWS: Document the new minor mode.

* doc/misc/dbus.texi (Top): Add "Inhibitor Locks" submenu.
Remove trailing period from chapter and section titles.
(Inhibitor Locks): New node.

* etc/NEWS: New D-Bus functions to support systemd inhibitor locks.
Presentational fixes and improvements.

* src/dbusbind.c (xd_registered_inhibitor_locks): New variable.
(Fdbus_make_inhibitor_lock, Fdbus_close_inhibitor_lock)
(Fdbus_registered_inhibitor_locks): New DEFUNs.  (Bug#79963)
(syms_of_dbusbind_for_pdumper): Initialize
`xd_registered_inhibitor_locks'.
(syms_of_dbusbind): Declare subroutines
`Sdbus_make_inhibitor_lock', `Sdbus_close_inhibitor_lock' and
`Sdbus_registered_inhibitor_locks'.  Declare symbol `Qdbus_call_method'.
staticpro `xd_registered_inhibitor_locks'.

* test/lisp/net/dbus-tests.el (dbus--test-systemd-service)
(dbus--test-systemd-path, dbus--test-systemd-manager-interface):
New defconsts.
(dbus-test10-inhibitor-locks): New test.

* lisp/ielm.el (ielm-dynamic-return): Add new value `point' to
user option.
(ielm-return): Implement it (bug#80123).