Is it possible to use bubble element stabilization in FEniCSX for quadrilateral cells? Apparently not, since in the ufl the bubble element is registered only for simplices.
Attempt to create the bubble enriched element with the code
vector_u = VectorElement( NodalEnrichedElement( FiniteElement( "Lagrange", mesh.ufl_cell(), 1 ), FiniteElement( "Bubble", mesh.ufl_cell(), mesh.topology.dim + 1 ) ) )
leads to the error
Cellname "quadrilateral" invalid for "Bubble" finite element.
Will there be support for bubble elements for quadrilaterals in the near future, or is there some other way to implement a mini element stabilization in FEniCSX?