Merge branch 'qt-4.7-from-4.6' of scm.dev.nokia.troll.no:qt/qt-integration into 4.7-integration

* 'qt-4.7-from-4.6' of scm.dev.nokia.troll.no:qt/qt-integration:
  Implement QAudioInput::suspend() using CMMFDevSound::Stop()
  Discard buffer pointer when DevSound is stopped
  Suppress overflow errors raised by Symbian DevSound during playback
  Discard empty buffer on call to QAudioOutput::resume()
  Permit QAudioOutput::processedUSecs() to be called immediately after start()
  Discard all DevSound buffers held when QAudioInput::suspend() called
  Fixed buffer overrun in Symbian QAudioInput backend
  Prevent crash in QGLGlyphCache due to dangling context references.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/opengl/qpaintengine_opengl.cpp b/src/opengl/qpaintengine_opengl.cpp
index a5ec12f..58778ea 100644
--- a/src/opengl/qpaintengine_opengl.cpp
+++ b/src/opengl/qpaintengine_opengl.cpp
@@ -4735,9 +4735,11 @@ void QGLGlyphCache::cacheGlyphs(QGLContext *context, QFontEngine *fontEngine,
         font_cache = new QGLFontGlyphHash;
 //         qDebug() << "new context" << context << font_cache;
         qt_context_cache.insert(context, font_cache);
-        if (context->isValid() && context->device()->devType() == QInternal::Widget) {
-            QWidget *widget = static_cast<QWidget *>(context->device());
-            connect(widget, SIGNAL(destroyed(QObject*)), SLOT(widgetDestroyed(QObject*)));
+        if (context->isValid()) {
+            if (context->device()->devType() == QInternal::Widget) {
+                QWidget *widget = static_cast<QWidget *>(context->device());
+                connect(widget, SIGNAL(destroyed(QObject*)), SLOT(widgetDestroyed(QObject*)));
+            }
             connect(QGLSignalProxy::instance(),
                     SIGNAL(aboutToDestroyContext(const QGLContext*)),
                     SLOT(cleanupContext(const QGLContext*)));