Fix composition on xcb with misconfigured ibus

If ibus has been set, but either isn't installed or doesn't launch, all
composition fails on xcb. This ensures we fallback to "compose" which
is needed for working composition on XCB.

Change-Id: Ic2061c330bcb907759a13920c3eede14f3036563
Reviewed-by: René J.V. Bertin <rjvbertin@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/plugins/platforms/xcb/qxcbintegration.cpp b/src/plugins/platforms/xcb/qxcbintegration.cpp
index 859b55b0d8..b372ecd7c4 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.cpp
+++ b/src/plugins/platforms/xcb/qxcbintegration.cpp
@@ -289,12 +289,15 @@ QAbstractEventDispatcher *QXcbIntegration::createEventDispatcher() const
 
 void QXcbIntegration::initialize()
 {
+    const QLatin1String defaultInputContext("compose");
     // Perform everything that may potentially need the event dispatcher (timers, socket
     // notifiers) here instead of the constructor.
     QString icStr = QPlatformInputContextFactory::requested();
     if (icStr.isNull())
-        icStr = QLatin1String("compose");
+        icStr = defaultInputContext;
     m_inputContext.reset(QPlatformInputContextFactory::create(icStr));
+    if (!m_inputContext && icStr != defaultInputContext && icStr != QLatin1String("none"))
+        m_inputContext.reset(QPlatformInputContextFactory::create(defaultInputContext));
 }
 
 void QXcbIntegration::moveToScreen(QWindow *window, int screen)