fix: calculate x position of tspan elements without explicit x prop

[klingebiel-sii]

Fixes #2931

If the x attribute of a <tspan> has not been defined explicitly, the current behavior causes the each <tspan> to inherit the x value of it's parent <text> element.

<Svg>
    <Text x="10" y="30">
        <Tspan>One</Tspan>
        <Tspan>Two</Tspan>
        <Tspan>Three</Tspan>
    </Text>
</Svg>

Is:

Should:

This PR fixes this issue by...

• resetting the inherited x value to the original x value of the <tspan>
• aggregating an offset for each children of a <text> node and using it as the child node's x value, if necessary

[changeset-bot]

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Latest commit: a6cf9f9

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