Created attachment 8705063 [details] capture See attachment. Happens on latest Aurora (build id: 20160106004003) but works fine in Nightly.
I can reproduce on GNU/Linux too. Nical, Bas, does it ring a bell?
I'm on Linux too, let's precise this until someone tries on Mac/Win.
Maybe related to bug 1225044 ?
Looks like a duplicate of bug 1235407 Guys, you confirm?
(In reply to Sylvestre Ledru [:sylvestre] from comment #4) > Looks like a duplicate of bug 1235407 > Guys, you confirm? I don't think so, that one's Windows only. Interestingly, here we are invalidating properly (according to paint flashing) but drawing crap instead of the content we should be drawing. No amount invalidation caused by hovering the misrendered parts help. Scrolling the list renders fine but that causes a different layerization. As soon as you stop scrolling and get back to the original flattened layer tree, painting is busted again. I haven't looked at the display lists yet, but I guess there's some kind of clipping that is different when the scrolling part has its own layer from when it is in the same layer as the rest of the page. Maybe the push-group Pop-group stuff (in the cairo backend), Bas?
(In reply to Nicolas Silva [:nical] from comment #5) > Maybe the push-group Pop-group stuff (in the cairo backend), Bas? Actually, it reproduces also with skia as the drawing backend, and with the OpenGL compositor. It doesn't seem to reproduce on Windows (10, with D3D11 compositing and D2D1 drawing).
Doesn't reproduce either with cairo as the drawing backend on Windows.
The width of the "glitched" area on the left of the list seems to be always roughly equal to the distance between the edge of the window and the list itself (it holds true as you resize the window). A similar thing happens on the Y axis, somewhat less noticeable. Looks like something is being computed in the wrong coordinate system.
Bas says it could be bug 1227210 which we'd need to uplift.
(In reply to Nicolas Silva [:nical] from comment #9) > Bas says it could be bug 1227210 which we'd need to uplift. ...aaaand confirmed. I asked for the uplift on the bug
Duping per comment 10