Fix that RenderEditable (TextField) ignores offset in painting, making text selections shifted when offset is nonzero (#109287)

Small fix in text layout math, unlikely to affect most normal usages.

Add `fromDirectional` factory to `RelativeRect` for when an app needs to consider both TextDirection.ltr and TextDirection.rtl.

```
RelativeRect.fromDirectional(
    textDirection: textDirection,
    start: 10.0,
    top: 20.0,
    end: 30.0,
    bottom: 40.0,
);
```

Addresses https://github.com/flutter/flutter/issues/107058.

This reverts commit 3f43d9f3.

Fixes a text clipping edge case.

* Use `curly_braces_in_flow_control_structures` for `rendering`

* fix comments

* fix dangling

* Support global selection

* addressing comments

* add new test

* Addressing review comments

* update

* addressing comments

* addressing comments

* Addressing comments

* fix build