[Lazarus] Comment about new LCL diff

[Werner Pamler]

Am 03.07.2017 um 14:37 schrieb Alexey via Lazarus:
> 1) name IsCanNNN, and even worse IsCanBeNNN. Pls rename to 
> CanStartDragging
> 2) end of func: replace to Result:= not PtInRect(..);

Done (r55428).