Emit property change signals for the IsStatusNotifierHostRegistered and
RegisteredStatusNotifierItems properties in StatusNotifierWatcher,
so code relying on the PropertiesChanged signal, instead of signals
such as StatusNotifierHostRegistered, can work properly.
A library that is affected by this is the libappindicator-gtk3* library
and it can cause tray icons to be missing after starting swaybar due to
a race condition, as follows:
* An application using libappindicator-gtk3 starts, e.g. nm-applet.
* Some time later, swaybar starts.
* swaybar creates the StatusNotifierWatcher.
* libappindicator-gtk3 observes the new watcher, but it sees that
IsStatusNotifierHostRegistered=false, so it falls back to the
Freedesktop System tray protocol.
* swaybar creates the StatusNotifierHost.
At this point, libappindicator-gtk3 should "un-fallback" back to SNI.
However, since swaybar does not emit the PropertiesChange signal on
IsStatusNotifierHostRegistered, libappindicator-gtk3 doesn't get
notified, and stays in fallback state forever.
* As a result, nm-applet will not show in the swaybar tray.
This race can be made reliable by inserting a 1-second long sleep here:
03483ff370/swaybar/tray/tray.c (L57)
(*) Note that the libappindicator-gtk3 library has been mostly replaced
by libayatana-appindicator, which is not affected by this.
The affected version is still used by Arch Linux, source code at:
https://bazaar.launchpad.net/~indicator-applet-developers/libappindicator/trunk/files/298
This removes any pending messages once the item is destroyed.
Furthermore, this installs SNI event calbacks asynchronously
in order to prevent sd-bus from bypassing pending messages.
This commit mostly duplicates the wlr_log functions, although
with a sway_* prefix. (This is very similar to PR #2009.)
However, the logging function no longer needs to be replaceable,
so sway_log_init's second argument is used to set the exit
callback for sway_abort.
wlr_log_init is still invoked in sway/main.c
This commit makes it easier to remove the wlroots dependency for
the helper programs swaymsg, swaybg, swaybar, and swaynag.
