The first try to port Clone Brush into LoD system

It almost works, except that when the user does overlapping
self copying strokes (bitBltOldData). That is in this part:

{
    KisPainter copyPainter(m_srcdev);
    copyPainter.setCompositeOp(COMPOSITE_COPY);
    copyPainter.bitBltOldData(0, 0, realSourceDevice, srcPoint.x(), srcPoint.y(), sw, sh);
    copyPainter.end();
}

Looks like the transaction for the projection is not started
or somehow cleared.

CCBUG:371938