replaced wxFDIODispatcher::RunLoop() with Dispatch() which handles only one event at a time (part 1 of the patch 1733626)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47470 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/fdiodispatcher.h

@@ -55,8 +55,8 @@ public:
     // unregister descriptor previously registered with RegisterFD()
     virtual bool UnregisterFD(int fd) = 0;
 
-    // loops waiting for an event to happen on any of the descriptors
-    virtual void RunLoop(int timeout) = 0;
+    // wait for an event for at most timeout milliseconds and process it
+    virtual void Dispatch(int timeout = TIMEOUT_INFINITE) = 0;
 
     virtual ~wxFDIODispatcher() { }
 };