[BUG]: erasing effect of shadows

[ShaMan123]

Shadows were not taken into account when designing the erasing effect unfortunately.
This breaks the entire approach...

A possible solution could be to use context isolation to erase the shadows.
An app could decide that during erasing shadows are not erasable... that is easy to do if the shadow is treated as a non erasable object. But is that desired? Probably not

Screen.Recording.2024-05-26.at.8.51.10.mov

[ShaMan123]

Using a loop renderer with dirty rect optimization could enable refactoring the erasing effect entirely and as a result solve this issue.
The impl could be to render the erasing effect on each object, tracking the pointer while drawing.
In that case it will make sense making the eraser to be a standalone 2d canvas impl and drop the fabric impl.