Patches concerning the speed of mouse-movement over the profile.

[Tomaz Canabrava]

> in terms of leaks, the profile mouse over is leaking about 1mb every
> 15 seconds, but that could be Qt related (if we can isolate it in a
> simple test app that is).
>

I'v answered lubomir with a 7mbs+ callgrind file data so he can help me
triage this, in the meantime, another patch to reduce the amount of calls
uneeded in the mouseMoveEvent calls. :)
I'm thinkering of a way to reduce the amount of new's and deletes in the
toolTipItem now.
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