KisPainter::bitBlt using random accessor

[Dmitry Kazakov]

Hi, All!

Why KisPainter uses KisRandomAccessor for accessing the pixels? Why doesn't
it use rect iterator? In many cases (at least for layer stack update) there
will be no shift between data managers, so the tiles will be copied at once.
So why?

-- 
Dmitry Kazakov
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