[REVIEW-3-5] Fix fdo#45219 wrong transparency for animated objects.

[Thorsten Behrens]

Hi there,

  http://cgit.freedesktop.org/libreoffice/core/commit/?id=2c7e061997202df9e602e209cf40c61606582e8e

fixes the most obvious glitch in fdo#45219 - multiple paints of the
same sprite on top of each other, killing the hue for transparent
objects.

(std::unique in this case _needs_ to eliminate duplicate, but
otherwise equal-under-SpriteWeakOrder entries. Also, std::unique
wants a BinaryPredicate, not a StrictWeakOrder. Note further that
the used rtl::Reference does have a working operator==)

Cheers,

-- Thorsten
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