Dear Deal.II community,

I am currently fixing an orientation issue for some (non-primitive) vector 
elements with the help of two other Deal.II developers/maintainers.

I have a quick question: On complicated meshes some faces can have a 
non-standard orientation or they can be rotated against the neighboring 
face. This causes inconsistencies for some vector elements.

In principle this potentially causes inconsistencies for FE_Q elements as 
well (for all dofs located at vertices, lines and faces). But that is being 
taken care of in the library, so everything seems fine.

In order to understand the issue better for other elements: where in the 
library is this being taken care of? I have difficulties to find that. 

Remark: I found a table in (fe.h/fe.cc) that derived elements need to 
implement that takes care of local dof permutations on quads (not full 
faces and hence not line dofs or vertex dofs). Now, lines can have 
different orientations but lines also permute within a cell upon face 
orientation/rotation changes.

Can anyone point me to the place in Deal.II where this is being taken care 
of for FE_Q?

Best,
Konrad

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