Duplicate backslashes generated in .pro file

Under certain circumstances, Creator will generate duplicate backslashes in .pro files, like so:

SOURCES += \ \
    test.cpp

Steps to repeat:

1) Start with a simple .pro file:

SOURCES += \

2) Open the project in Creator (choose any kit)

3) Right-click the "Projects" tree entry of the project, and choose "Add new..."

4) Select "C++ source file" (1st wizard page)

5) Choose a name and keep the preselected location (2nd wizard page)

6) "Finish" keeping default selections (3rd wizard page)

--> Surplus backslash added to .pro file