* doc/misc/tramp.texi (External packages): Mention also special events.
Emphasise, that Tramp raises remote-file-error.

* etc/NEWS: Tramp signals 'remote-file-error' consequently.
Presentational fixes and improvements.

* lisp/net/tramp.el (tramp-skeleton-process-file)
(tramp-handle-make-symbolic-link, tramp-process-actions)
(tramp-wait-for-regexp, tramp-send-string):
* lisp/net/tramp-adb.el (tramp-adb-get-device)
(tramp-adb-send-command-and-check, tramp-adb-barf-unless-okay)
(tramp-adb-wait-for-output, tramp-adb-maybe-open-connection):
* lisp/net/tramp-archive.el (tramp-archive-handle-not-implemented):
* lisp/net/tramp-crypt.el (tramp-crypt-do-encrypt-or-decrypt-file-name)
(tramp-crypt-do-encrypt-or-decrypt-file):
* lisp/net/tramp-gvfs.el (tramp-gvfs-dbus-event-error)
(tramp-gvfs-maybe-open-connection):
* lisp/net/tramp-sh.el
(tramp-do-directory-files-and-attributes-with-perl)
(tramp-do-copy-or-rename-file-directly)
(tramp-do-copy-or-rename-file-out-of-band)
(tramp-sh-handle-file-local-copy, tramp-sh-handle-write-region)
(tramp-bundle-read-file-names, tramp-maybe-send-script)
(tramp-find-file-exists-command, tramp-barf-if-no-shell-prompt)
(tramp-maybe-open-connection, tramp-wait-for-output)
(tramp-send-command-and-check, tramp-barf-unless-okay)
(tramp-send-command-and-read, tramp-get-ls-command):
* lisp/net/tramp-smb.el (tramp-smb-handle-file-attributes)
(tramp-smb-handle-make-symbolic-link)
(tramp-smb-maybe-open-connection, tramp-smb-call-winexe):
* lisp/net/tramp-sshfs.el (tramp-sshfs-maybe-open-connection):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-send-command-and-read):
Raise a `remote-file-error' in case of connection problems.

* lisp/net/tramp-rclone.el (tramp-rclone-maybe-open-connection): Improve
check for host.

* lisp/net/tramp-smb.el (tramp-smb-get-localname): Improve error message.

* lisp/net/tramp-sudoedit.el (tramp-default-host-alist):
Set a default for "sudoedit" method.
(tramp-sudoedit-maybe-open-connection): Check for proper host name.
(tramp-sudoedit-send-command): Do not expand ?h.

* lisp/net/tramp.el (tramp-compute-multi-hops): Check for cycle
proxy definition.

* test/lisp/net/tramp-archive-tests.el (tramp-archive-test20-file-modes)
(tramp-archive-test21-file-links): Check for `rmote-file-error'.

* test/lisp/net/tramp-tests.el (tramp-file-name-with-sudo): Declare.
(tramp--test-ignore-make-symbolic-link-error): Check for
`rmote-file-error'.
(tramp-test03-file-name-method-rules): Delete.
(tramp-test03-file-error): New test.
(tramp--test-supports-processes-p): Make it more rebust.

* doc/misc/dbus.texi (Synchronous Methods): Adapt `dbus-call-method'.
(Asynchronous Methods): Adapt `dbus-call-method-asynchronously'.
(File Descriptors): New chapter, replaces Inhibitor Locks.

* etc/NEWS: Replace "New D-Bus functions to support systemd
inhibitor locks" by "Support D-Bus file descriptor manipulation".
Presentational fixes and improvements.

* lisp/net/dbus.el (dbus-call-method)
(dbus-call-method-asynchronously): Adapt docstring.
(dbus-list-hash-table): Return (nreverse result).
(dbus-monitor-goto-serial): Declare `completion'.

* src/dbusbind.c (Fdbus_message_internal, xd_read_message_1):
Handle `:keep-fd'.
(xd_registered_inhibitor_locks, Fdbus_make_inhibitor_lock)
(Fdbus_close_inhibitor_lock, Fdbus_registered_inhibitor_locks): Delete.
(xd_registered_fds): New variable.
(Fdbus__fd_open, Fdbus__fd_close, Fdbus__registered_fds):
New DEFUNs.  (Bug#79963)
(syms_of_dbusbind_for_pdumper): Initialize `xd_registered_fds'.
(syms_of_dbusbind): Remove subroutines
`Sdbus_make_inhibitor_lock', `Sdbus_close_inhibitor_lock' and
`Sdbus_registered_inhibitor_locks'.  Remove symbol `Qdbus_call_method'.
Declare subroutines `Sdbus__fd_open', `Sdbus__fd_close' and
`Sdbus__registered_fds'.  Declare symbol `QCkeep_fd'.  staticpro
`xd_registered_fds'.

* test/lisp/net/dbus-tests.el (dbus-test10-inhibitor-locks): Delete.
(dbus-test10-keep-fd, dbus-test10-open-close-fd): New tests.

* doc/misc/widget.texi (Widgets and the Buffer): Fix the
signatures of 'widget-forward' and 'widget-backward'.  Reported by
Tim Landscheidt <tim@tim-landscheidt.de>.

* lisp/wid-edit.el (widget-forward, widget-backward)
(widget-move): Doc fixes.

Previously, if 'calc-string-maximum-character' wasn't a valid
character 'math-vector-is-string' would throw an error in the
comparison, leading to an incomplete display of the stack and a
cryptic error message.  Instead, have 'math-vector-is-string'
return nil, which effectively disables the display of strings.
Refines feature introduced in bug#78528.
* doc/misc/calc.texi (Customizing Calc): Update description of
behavior for invalid 'calc-string-maximum-character'.
* lisp/calc/calccomp.el (math-vector-is-string): Return nil when
'calc-string-maximum-character' doesn't represent a character.
* test/lisp/calc/calc-tests.el (calc-math-vector-is-string): Correct
and simplify tests.

* 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.

* doc/misc/dbus.texi (Signals): All registered signal handlers are
called.
(Synchronous Methods, Signals, Monitoring Messages): Add function
result in examples.

* src/dbusbind.c (xd_store_event): New function.
(xd_read_message_1): Use it.  Call all registered handlers per
signal.  (Bug#80168)

* test/lisp/net/dbus-tests.el (dbus--test-signal-handler): Adapt defun.
(dbus--test-signal-handler1, dbus--test-signal-handler2): New defuns.
(dbus-test05-register-signal-several-handlers): New test.
(dbus-test04-register-method)
(dbus-test04-call-method-authorizable)
(dbus-test05-register-signal)
(dbus-test05-register-signal-with-nils)
(dbus-test06-register-property-emits-signal): Adapt tests.

* doc/misc/eglot.texi (Eglot Commands)
(Customization Variables): Advertise eglot-momentary-inlay-hints.

* etc/EGLOT-NEWS: Advertise new command.

* lisp/progmodes/eglot.el (eglot--momentary-hints-data): New variable.
(eglot-momentary-inlay-hints): New command.

This documents how to use LSP multiplexer programs like Rassumfrassum
to connect multiple language servers to a single buffer.

* doc/misc/eglot.texi (Top): Add "Multi-server support" menu entry.
(Multi-server support): New chapter.
(Using Rassumfrassum, Design rationale): New sections documenting
how to use the Rassumfrassum multiplexer program with Eglot, with
practical examples for C++, Python, and multi-language files.
(Performance): Mention Rassumfrassum as solution for JSONRPC traffic
performance issues.
(Reporting bugs): Add guidance for troubleshooting multiplexer-related
bugs.  Improve project description guidance.  Fix various typos.
* lisp/progmodes/eglot.el (eglot-server-programs): Add a couple
of rass entries.

* etc/EGLOT-NEWS: Announce support for LSP server multiplexers via
Rassumfrassum.