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bbfa235
(Get the code!)
quequotion, the FreeDesktop notifications specification is for asynchronous notifications. Since five years before Notify OSD was released -- since before Ubuntu even existed -- it has been right there in the very first sentence of the specification: "to notify the user in an asynchronous manner of events".
I reiterated that fact in my comments in this bug report on 2009-10-02 and 2009-11-23. If you try to use it for synchronous things, such as displaying which TV channel you've just switched to, you should not be remotely surprised that some implementations don't do what you want.
As I said in those comments four years ago, if you want to provide synchronous feedback, you should draw your own synchronous notification. Notify OSD is open source, so you could copy and adapt its rendering code if you wish.