b0e4c31bb0
When a stroke has a gradient fill material that starts with a color with zero alpha, the tint modifier would behave as if it's not effective at all, this is caused by referencing source material color only with the starting color in this case, and since the alpha is zero, the tint is applied wrongly. Now use average color of start and end color of the gradient to mix with the tint modifier color. Note that this isn't technically correct still, since material gradient is computed in the shader, and tint modifier isn't able to get the acutal fill color at a given vertex (especially for the radial gradient case) however the result of this patch looks visually good enough, and users can always set all alpha to 1 when they feel the color is off. Pull Request: https://projects.blender.org/blender/blender/pulls/134549
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