Fix accessibility on XCB when running as root

Accessibility actually works when running applications as root, but we
would never properly connect, since the enabledChanged signal would be
emitted from the constructor in this case. So after connecting the
signal, check the value by hand to make sure not to miss the
notification.

Only applications running as root would be affected, because all other
applications would go through the asynchronous pattern of getting the
bus address from dbus instead.

[ChangeLog][QtGui][Accessibility] On XCB applications running as root are
now accessible.

Pick-to: 6.5
Fixes: QTBUG-43674
Change-Id: I82cdc35f00693a8366dfcdab2f2c3c6dc5f5b783
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/accessible/linux/qspiaccessiblebridge.cpp b/src/gui/accessible/linux/qspiaccessiblebridge.cpp
index 8961055f1b..f59d8be18b 100644
--- a/src/gui/accessible/linux/qspiaccessiblebridge.cpp
+++ b/src/gui/accessible/linux/qspiaccessiblebridge.cpp
@@ -33,6 +33,14 @@ QSpiAccessibleBridge::QSpiAccessibleBridge()
 {
     dbusConnection = new DBusConnection();
     connect(dbusConnection, SIGNAL(enabledChanged(bool)), this, SLOT(enabledChanged(bool)));
+    // Now that we have connected the signal, make sure we didn't miss a change,
+    // e.g. when running as root or when AT_SPI_BUS_ADDRESS is set by hand.
+    // But do that only on next loop, once dbus is really settled.
+    QTimer::singleShot(
+        0, this, [this]{
+            if (dbusConnection->isEnabled())
+                enabledChanged(true);
+        });
 }
 
 void QSpiAccessibleBridge::enabledChanged(bool enabled)