When generating a vcxproj file it can end up with extra whitespaces in the custom build commands which causes it to always rebuild

With Qt Add-in for Visual Studio during the qmake project generating some white-spaces are included into the vcxproj-file.

The problem seems to have its effect on rebuilding the entire project even if the very small changes were done in a source code.

The problem appears only when the user is trying to create a qmake project with addin in Visual Studio. From the command-line the vcxproj is generated without any additional white-spaces.

When build-process is started, the VS is throwing this warning

1>C:\Program Files
(x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(151,5): warning
MSB8015: Forcing a rebuild of all source files due to the contents of
"C:\Users\luroddis\Desktop\TestFilesLukeRoddis -
Copy\Win32\Debug\custombuild.command.1.tlog

Two generated vcxproj-files can be found from attachments. To find the white-spaces mentioned above, the one should look for the <Command
Condition> -item

Steps to reproduce:
1. Build the project attached
2. Make some changes in the project files
3. Choose the build-command from the menu
4. In looks you should be able to see the warning mentioned in description