Fixed: view coordinate conversion broken by previous commit.

Without this fix, -CPView convertPoint:fromView was broken due to the changes made in #1998. In particular, the transform for the fromView would be calculated and then just thrown away if the views were in the same window. This happened to work in some specific cases and the lack of unit tests concealed the error.

This fix properly applies the transforms when two views are in the same window without one of them necessarily being inside the other.

Refs #1998.