[REVIEW-3-5] Use transparency for gradients fdo#45219

[Thorsten Behrens]

Hi there,

previously, vclcanvas simply ignored transparency settings for
gradient fills.

 http://cgit.freedesktop.org/libreoffice/core/commit/?id=3f5efa1e76e187070d412d102e4c057679065bcc

fixes this by filling the appropriate area with either black or
white (note that vclcanvas has 1bpp alpha).

Cheers,

-- Thorsten
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