attrs for line arrows are taken from the parent line instead of the arrow object

[ensconced]

I tried using the form at https://antv-issue-helper.surge.sh but it was not working.

This issue is in @antv/g-svg 0.5.6. I know this is an old version, but I would like to open a PR to fix it. If I do so, would it be possible to release a version 0.5.7? This bug is affecting @antv/g6, which currently depends on "@antv/g-svg": "^0.5.1", (in the @antv/g6-pc package.) If we can release a 0.5.7 to fix this, I would then open a PR to upgrade @antv/g6 to use 0.5.7.

Here is an example of the issue:
https://codesandbox.io/s/wild-rain-mhgy08?file=/src/index.js:0-431

The arrow should have a blue fill and green stroke, but instead it uses the stroke and fill from the parent line shape.

Result when using @antv/g-svg:

Expected result (this is using @antv/g-canvas, although I had to edit the path of the arrow slightly to get the same shape):

Would you accept a PR from me to fix this?

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