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aa752e4d45
Implement DOMPoint.fromPoint
<!-- Please describe your changes on the following line: -->
Implements DOMPoint.fromPoint and fixes codegen to use default value when an optional dictionary member got `undefined`.
PS: The codegen change is about:
```webidl
dictionary MyDictionary {
optional short myMember = 0;
short anotherMember;
}
[Exposed=Window, Constructor]
interface MyInterface {
void myMethod(optional MyDictionary myDict);
};
```
```js
// The following two must behave same
new MyInterface().myMethod({ myMember: undefined, anotherMember = 0 });
new MyInterface().myMethod({ anotherMember = 0 });
```
---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #23710
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- [x] There are tests for these changes
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This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23711)
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