Qwt playground curvetracker demo

[HappyCoder]

Hello,

i have a question to that curvetracker demo from Qwt.

-> moving the tracker to the right -> vertical line from tracker visible
<- moving the tracker to the left -> vertical line from tracker NOT visible till i stop moving the mouse

Can someone confirm this?
Why is the vertical line not visible while moving to the left?

Compiled and tested on Windows 7 x64, MingGW 4.9.2 and Qt 5.5

Greetings
Stefan

[Surfman19]

i cannot confirm this on ubuntu linux! it works fine there.