Support blendModes with NineSlicePlane and CanvasRenderer

[ivanpopelyshev]

That's from Mesh:

renderer.context.globalAlpha = mesh.worldAlpha;
renderer.setBlendMode(mesh.blendMode);

blendMode line is missing in NineSlicePlane. I can be a problem if something sets not-normal blendmode before NineSlicePlane is rendered.

Previously in Canvas Mesh: #4535

[bigtimebuddy]

👍 Verified

Broken (current dev):
https://jsfiddle.net/e60yhvex/

Fixed (this PR):
https://jsfiddle.net/0kt7gLyn/

Intended Result

[ivanpopelyshev]

Good, I just want to mention that usually people dont use anything except Normal on NineSlice, but they can use different blendMode in the element that appears before Plane

[lock]

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