QtQuick ListView: Render Artefacts with huge models

Please have a look at the attached screenshots.

The "renderbug_artefact" one illustrates the problem that is starting to show when ListView's contentY has a value larger that 4751073: Some horizontal lines have a wrong width or are not shown at all.

The problematic contentY value seems to depend on the:

• window height
• the number of rectangles for each row

I would rule out OpenGL driver issues as I can see that effect on two Macs with differents GPUs and on Windows 7 inside VMWare.

The ListView has pixelAligned=true and the delegates are of integer height to avoid any subpixel alignment issues. I've checked the delegates y coordiantes to be integers too.

Dumping the scene graph tree did not give me any hint about the problem.

The example is derived from a calendar widget using an index representing the week number, thus the huge (actually virtual) model range.