indicator-application hack: fallback to dbus service check

There is a hack to work with Canonical's indicator-application tray
applet. Since it implements the SNI spec partially and doesn't work
with IconPixmap, the icon is broken without the hack.

Unfortunately, this tray implementation is still in active use by
Ubuntu; it's shipped and enabled by default on at least:
* Xubuntu
* Ubuntu MATE
* Ubuntu Budgie
(and maybe even others)

Unfortunately, the check doesn't work in confined environments
providing broken tray icons for snapped & flatpak'ed apps.
Fortunately, snap allows checking all registered services on the host.
It also fixes the check on flatpak if permissions to talk with these
names are given.

Pick-to: 6.1 6.0
Change-Id: Iee5d0bb610c3ff397babee89ef1ee788ac19f477
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/platform/unix/dbustray/qdbustrayicon.cpp b/src/gui/platform/unix/dbustray/qdbustrayicon.cpp
index 1194e4ac66..892a99d726 100644
--- a/src/gui/platform/unix/dbustray/qdbustrayicon.cpp
+++ b/src/gui/platform/unix/dbustray/qdbustrayicon.cpp
@@ -208,6 +208,14 @@ QTemporaryFile *QDBusTrayIcon::tempIcon(const QIcon &icon)
         uint pid = session.interface()->servicePid(KDEWatcherService).value();
         QString processName = QLockFilePrivate::processNameByPid(pid);
         necessary = processName.endsWith(QLatin1String("indicator-application-service"));
+        if (!necessary) {
+            necessary = session.interface()->isServiceRegistered(
+                QStringLiteral("com.canonical.indicator.application"));
+        }
+        if (!necessary) {
+            necessary = session.interface()->isServiceRegistered(
+                QStringLiteral("org.ayatana.indicator.application"));
+        }
         if (!necessary && QGuiApplication::desktopSettingsAware()) {
             // Accessing to process name might be not allowed if the application
             // is confined, thus we can just rely on the current desktop in use