[Bug 56960] clicking a compile error tries to open document in wrong directory

[Jörg Rüppel]

I think I understand the problem now. My makefiles don't work recursively, so 
they don't emit any directory navigation messages. However, Gideon made a 
good guess somehow prior to 1.80 of makewidget.cpp, it just left out the 
project directory. Hope this helps.