Warning for non-rigid transformations

[vigji]

Some combinations of view orders (eg, the ones that don't preserve the sequence of axes) result in a flip of the stack (negative net of transform matrix). The specification of the origin is a nice system but might give problems with accidental funny transformations (resulting eg in flipped left-right in the space). There should be an error thrown, that can be overwritten passing an explicit parameter to the transformation.

[RahulBera15]

Hi, I’m Rahul and I’m interested in working on this issue.

I’m reviewing the code to understand where transformations are handled.
Before starting, could you confirm whether the preferred behavior is to
raise an error by default for non-rigid transformations, with an option
to override via an explicit parameter?

Thanks!

[adamltyson]

I think I would prefer a warning, not sure what others think cc @brainglobe/active-devs

[IgorTatarnikov]

I agree, a warning seems more appropriate!