[ARRISAPOL-3803] Notify buffering state also in pipeline state transition

Author: Volodymyr Ogorodnik

Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp

@@ -2742,6 +2742,13 @@ void MediaPlayerPrivateGStreamer::updateStates()
     case GST_STATE_CHANGE_ASYNC:
         GST_DEBUG_OBJECT(pipeline(), "Async: State: %s, pending: %s", gst_element_state_get_name(m_currentState), gst_element_state_get_name(pending));
         // Change in progress.
+        //If we are buffering now, we could miss HaveCurrentData state if buffering finished before the transition complete.
+        if (m_isBuffering)
+        {
+            GST_INFO_OBJECT(pipeline(), "Async: [Buffering] still buffering, so force HaveCurrentData.");
+            m_readyState = MediaPlayer::ReadyState::HaveCurrentData;
+            m_networkState = MediaPlayer::NetworkState::Loading;
+        }
 
         // Delay the m_isBuffering change by returning it to its previous value. Without this, the false --> true change
         // would go unnoticed by the code that should trigger a pause.