Better patch to replace !218.
- Auto and quick detection of previous D-Bus instance;
- Remove private D-Bus compile definition, only use it on macOS without an existing D-Bus instance;
- Safe reboot after crashes because the indicator is not relating on the kdeconnectd to run a D-Bus session;
- Safe exit after clicking on `Quit` in the systray.
More details in commit logs:
Only enable private D-Bus on macOS because the other platforms do not
need them.
The app should be able to easily detect the session bus from the env
DBUS_LAUNCHD_SESSION_BUS_SOCKET from launchd through launchctl.
Because https://gitlab.freedesktop.org/dbus/dbus/-/blob/master/dbus/dbus-sysdeps-unix.c#L4392
shows that it is the only probing method on macOS with launchd.
The D-Bus session bus can be easily found from launchd/launchctl
with DBUS_LAUNCHD_SESSION_BUS_SOCKET env. It can be an external one
(installed from HomeBrew) or an internal one (launched by a previous
instance followed by a crash).
The indicator helper on macOS can now automatically detect whether we can use a potentially
(with launchd/launchctl env set, or KDE Connect macOS
private_bus_address set) existed and usable session bus.
If previous bus is usable, just try to launch the kdeconnectd with us.
Otherwise, launch a private D-Bus daemon, export the launchd/launchctl
env, and run a kdeconnectd instance.
Everything works better and quicker now :)
## Summary
On MacOS the system tray icon is off-color because it uses the gray-colored `kdeconnectindicatordark` icon which does not match the rest of MacOS.
BUG: 430226
I've used two patches to fix this:
1. Always use the status `KStatusNotifierItem::Passive` on MacOS. `KStatusNotifierItem` will only mark the icon as a mask (which is needed to allow it to dynamically switch between light and dark theme) [if the status is passive](cff7c337ab/src/kstatusnotifieritem.cpp (L1079-1081)).
2. The above should theoretically be enough to fix the issue and I swear at one point it was all that was needed. However, to fix this issue in my dev environment I also needed to pass in a `QIcon` with `setIsMask(true)` instead of setting the icon by its name. And I also use the `kdeconnectindicator` instead of `kdeconnectindicatordark` icon.
## Test Plan
The icon now renders in the correct color, regardless of whether devices are connected:
 
## Future work
Once I've verified this PR is working in the right direction, I want to look into making the icon gray (and hopefully a much easier-to-see gray) when no devices are connected!
For example, WireGuard, when not connected, looks like this:
 
P.S. I've been testing off the v21.12.2 tag since the master branch doesn't compile for me, so I haven't tested this change on the latest dev commit. But there should be no conflicts.
