The orientation type 'Natural' should only lock to x-primary

[hexalys]

The following definition has contradictions, leading to confusion as to what is natural:

natural: Append portrait-primary, portrait-secondary, landscape-primary or landscape-secondary to orientations such as the associated screen orientation angle is 0.

The angle shall never be 0 on a -secondary position. The point of natural is to be a unique 0 angle opposite of a 180 reverse angle. Allowing an implementation to lock to natural to x-secondary would reduce natural to an orientation as opposed to an angle.

It should definitely not be the same as any. A platform convention is most likely to append natural with an 'any' lock anyway. Most importantly, the angle relationship with portrait-primary, portrait-secondary, landscape-primary or landscape-secondary cannot change arbitrarily during runtime.

Also how about adding a current orientation lock.

[hexalys]

@mounirlamouri Any review of this issue yet? Instead it should be:

natural: Append portrait-primary or landscape-primary to orientations such as the associated screen orientation angle is 0.

[mounirlamouri]

Thanks for the report @hexalys and sorry for taking so long to reply. PR #84 is fixing this. Feel free to leave a comment there if it doesn't match what you were expecting.