[CMake] Visual Studio 10 property pages for single source file gone with CMake 2.8.5 and 2.8.6

[Niels Dekker - address until 2014]

When Visual Studio 10 vcxproj files are generated by CMake 2.8.5 or 2.8.6, 
it is typically impossible to view the C/C++ properties of a single source 
file. CMake 2.8.0 to 2.8.4 do not seem to have this issue. It looks like the 
issue is caused by the fact that CMake 2.8.5 started storing the absolute 
path names of the source files (even when CMAKE_USE_RELATIVE_PATHS is ON).

Is that a known issue?

Visual Studio 10 does not allow viewing the C/C++ properties of source files 
that are listed by their absolute path names. See VS10 bug report 635294, 
"Using absolute path in ClCompile item prevents property pages from 
showing", by Niels M Hansen, 1/9/2011: 
https://connect.microsoft.com/VisualStudio/feedback/details/635294/using-absolute-path-in-clcompile-item-prevents-property-pages-from-showing

However, it seems like Visual Studio 10 *does* correctly support absolute 
path names *without* drive letter! Would it be possible for CMake to write 
the source file names *without* the drive letter, when it generates Visual 
Studio 10 vcxproj files? (Especially when the generated vcxproj files are 
located at the same drive as the source files.)

Kind regards,

   Niels
-- 
Niels Dekker
http://www.xs4all.nl/~nd/dekkerware
Scientific programmer at LKEB, Leiden University Medical Center