[eigen] Assignment of product to X.noalias() does not resize X

[Jitse Niesen <jitse@xxxxxxxxxxxxxxxxx>]

Hello,

What is the reason behind the following inconsistency (using the current 
revision of the development branch)?

-------------
#include <Eigen/Core>
#include <Eigen/Array>

using namespace Eigen;

int main()
{
  MatrixXf A = MatrixXf::Random(12,12);
  MatrixXf A2;
  A2 = A * A;			// works
  std::cout << A2(1,1) << std::endl;
  MatrixXf A3(12,12);
  A3.noalias() = A * A;		// works
  std::cout << A3(1,1) << std::endl;
  MatrixXf A4;
  A4.noalias() = A * A;		// does NOT work
  std::cout << A4(1,1) << std::endl;
}
-------------

The assignment to A4 complains (via a run-time assertion) that A4 has the 
wrong dimension. Yet when we leave out the noalias(), as in the assignment 
to A2, it does resize the matrix to the correct dimension.

In the 2.0 branch, A4 = (A * A).lazy() does resize the matrix A4.

Cheers,
Jitse