When one instance of Dolphin activates another it passes a startupId (X11) / activation token (wayland) along.
On X11 this is passed using the DESKTOP_STARTUP_ID environment variable. The code tries to read that through KStartupInfo::startupId().
That doesn't work though, since Qt at startup reads the environment variable afterwards. However, it is nice enough to allow us to access
it through QX11Info::nextStartupId(). Use that to read the token in the first instance and pass it to the second instance like we do on Wayland
The user-facing impact of this is minimal since KStartupInfo::setNewStartupId internally falls back to KWindowSystem::forceActiveWindow when no
startupId is passed.
Summary: This code has been unused since the KF5 port.
Reviewers: #dolphin, #plasma
Subscribers: kfm-devel
Tags: #dolphin
Differential Revision: https://phabricator.kde.org/D18273
