Switching between header and source works only for files with same name

If the base name of the header and the according source file does not match switching between both files by typing F4 does not work.

Steps to reproduce:

• open tests/manual/cplusplus-tools/cplusplus-tools.pro
• open the source.cpp OR the header.h
• type F4

Expected behaviour:

• Creator switches between header.h and source.cpp

Current behaviour:

• Nothing happens