[kdenlive] Thank you JB! (Was: Beware of git master ... as I was told)

[Harald Albrecht]

It's time to pick up this topic again and send a public big THANK YOU! 
to Jean-Baptiste.

He has quickly fixed two ugly timeline corruption bugs concerning moving 
transitions and, in particular, the spacer tool. My own tests on recent 
projects showed no more corruptions.

So life on git master is much more enjoyable again. Did I learn 
something? Nah.

With best regards,
Harald