Fix the logic for Animated WebP images which contains a subsequence blend from the first frame, impact the `SDAnimatedImage`#14

Merged

kinarobin merged 2 commits intomasterfrom

bugfix_webp_blend_canvas

May 15, 2019

Commits on May 14, 2019

Fix the logic for Animated WebP images which contains a subsequence blend from the first frame, impact the `SDAnimatedImage`
dreampiggy
committed
Add the test case to ensure this behavior
dreampiggy
committed