For example, `_encodeParagraphStyle` says:
```dart
if (locale != null) {
result[0] |= 1 << 12;
// Passed separately to native.
}
```
We know `1<<12` is 4096.
On the other hand, the old code uses `0x800`, which is 2048.
And the strutStyle field is missing.
*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*
*List which issues are fixed by this PR. You must list at least one issue.*
*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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