Merge "Fix various flickering / artifacts"

    mHwWorkListDirty = false;

    HWComposer& hwc(graphicPlane(0).displayHardware().getHwComposer());

    if (hwc.initCheck() == NO_ERROR) {

        const DisplayHardware& hw(graphicPlane(0).displayHardware());

        uint32_t flags = hw.getFlags();

        if ((flags & DisplayHardware::SWAP_RECTANGLE) ||

            (flags & DisplayHardware::BUFFER_PRESERVED))

        {

            // we need to redraw everything (the whole screen)

            // NOTE: we could be more subtle here and redraw only

            // the area which will end-up in an overlay. But since this

            // shouldn't happen often, we invalidate everything.

            mDirtyRegion.set(hw.bounds());

            mInvalidRegion = mDirtyRegion;

        }

        const Vector< sp<LayerBase> >& currentLayers(mVisibleLayersSortedByZ);

        const size_t count = currentLayers.size();

        hwc.createWorkList(count);