Can't mix bricks with different heights in the same wall

[chrisaga]

I'have just found that if you change the height of the cyan brick in the wall example of the documentation, the position of the brick is wrong.

 \begin{wall}
  \wallbrick[color=blue]{2}{1}
  \wallbrick[color=red]{1}{1}
  \addtocounter{brickx}{1}
  \wallbrick[color=orange]{1}{1}
  \newrow
  \addtocounter{brickx}{1}{1}
  \wallbrick[color=cyan,brickheight=0.3]{4}{1}
 \end{wall}

I suspect the solution would be to use a "default height" to compute the "z-coordinate" of the brick, not the actual brick's height. Thought I didn't checked if it would complicate the code very much.