bug#43936: 28.0.50; D-Bus PropertiesChanged signal lacks interface argument.

[Hugh Daschbach]

The D-Bus specification
(https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties)
defines three arguments for
org.freedesktop.DBus.Properties.PropertiesChanged.  Currently, in
dbus.el, only two are provided.

The attached patch adds the interface parameter to the test
‘dbus-test06-register-property-emits-signal’
and to the sources of the signal: ‘dbus-register-property’ and
‘dbus-property-handler’.

Thanks,
Hugh

0001-Add-interface-arg-to-PropertiesChanged-signal.patch
Description: Add interface argument to PropertiesChanged signal and test.

In GNU Emacs 28.0.50 (build 20, x86_64-pc-linux-gnu, X toolkit, cairo version 
1.17.3, Xaw3d scroll bars)
 of 2020-10-11 built on klaatu
Repository revision: 0f79544368c0dc343edcd97c3c7992aeab415b68
Repository branch: submission
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Artix Linux

Configured using:
 'configure --with-x-toolkit=lucid'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: ERT-Results

Minor modes in effect:
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  auto-composition-mode: t
  auto-encryption-mode: t
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Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 124593 10066)
 (symbols 48 10063 1)
 (strings 32 26290 1920)
 (string-bytes 1 818696)
 (vectors 16 15108)
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