ricky 43f39bc2e3 [ASTextNode] Reset _composedTruncationText when attributedText is updated (#3210)
* [ASTextNode] Reset _composedTruncationText when attributedText is updated

Current issue:
1) Set `attributedText` in `ASTextNode` with whiteColor
2) `_composedTruncationText` gets updated to take on this new color attribute
3) Set the `attributedText` with greenColor
4) The `_composedTruncationText` gets updated with the new attributes, but does NOT overwrite any existing attributes — i.e., does not overwrite the white color with green. Comment from `_locked_prepareTruncationStringForDrawing:`:
`
// Add any of the original string's attributes to the truncation string,
// but don't overwrite any of the truncation string's attributes
`

* michael’s suggestion
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