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evas image update calculation - account for clipped color changes

Authored by raster on Aug 11 2016, 7:18 AM.

Description

evas image update calculation - account for clipped color changes

if clipped color changed and not object color on image objects, then
the updates could be missed. this also fixes some corner cases where
opaqueness should not count for update deletion too. this bug seems to
have been here a while unnoticed.

fixes T4246

@fix