- Introduces the ability to control whether RawMagnifier uses a clip on
its decoration. (It still has to use a clip for its magnified image.)
- Uses `BlurStyle.outer` to remove the clip for CupertinoMagnifier.
- Many changes to the documentation around magnifiers and shadows.
- Implements `BoxShadow.copyWith` which somehow we had never needed
before.
- Makes `debugDisableShadows` handle `BlurStyle.outer` correctly.
- Adds `MagnifierInfo.toString`.
- Aligns various `operator ==`s with the style guide.
- Makes MagnifierDecoration a separate concept from Decoration, since
it's not actually compatible anywhere.
- Removes some dead code and makes other minor code simplifications.
- Uses double syntax rather than integer syntax for various double
literals for clarity.
I expect one minor golden image change (antialiasing change on
Cupertino's magnifier test).
13bec286bd