playback of grace notes

I started looking at the grace-notes-after which don't seem to have any play-back implemented.
I'm afraid of opening can of worms, but I'd like to know what people expect for I make a big mess.
I've appended to an issue https://musescore.org/en/node/11090#comment-395176
I invite people to take a look at it.

One thing I'm not sure of is what are the expected semantics in the code of
chord->actualTicks()
Is this expected to include or exclude the time duration of the before and after grace notes?
My understanding is that chord->tick() is the starting tick even in the presence of leading
grace notes. It seems to me that actualTicks() needs to already have the grace-note time
subtracted from it.

Any opinion on this or other issues concerning grace note playback.