In attached example it is shown following scenario:
I want to render map and polylines into it (see Canvas "onPaintMethod").
During the rendering sometimes are some part of polyline is cropped. It looks like only some tiles are rendered.
The described behavior is not present in Qt 5.2, but in Qt5.3 it is.
I have made also the screencast for you
Most probably there is additionally some problem with nouveau driver. See dmesg output (it is probably not directly connected with this problem).
[1196128.721082] nouveau E[ PGRAPH][0000:01:00.0] ch 4 [0x00165000 editor] subc 7 class 0x4097 mthd 0x0208 data 0x00070345