Add opacity option to pattern in stroke

1. I am here to submit a feature request that hopefully be granted. Please add opacity option in pattern at stroke in blending options.

2. It's very valuable to me because it will make designing texts, and a lot more.. easier. Because instead of doing hard work and make a lot of patterns, do it on one way.

Best regards,

Daniel.

(I'm really sorry about my English, It's not that good)