Glob results differ when using forward vs back slashes

[natemcmaster]

Globbing patterns in nuspec using forward slashes do not match files. The same pattern with backslashes works.

Details

Using NuGet.exe 3.5.0.1938 on Windows 10

Repro

1. Create folder layout

TestPackage.nuspec
folder/
     test.txt

1. Use this nuspec

<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
  <metadata>
    <id>TestPackage</id>
    <version>1.0.0</version>
    <authors>name</authors>
    <description>description</description>
  </metadata>
  <files>
    <file src="folder/*.txt" target="dir1/" />
    <file src="folder\*.txt" target="dir2/" />
  </files>
</package>

2. nuget.exe pack TestPackage.nuspec

Expected result

NuGet package contains:

<nupkg>/
   TestPackage.nuspec
   dir1/
       test.txt
   dir2/
        test.txt

Actual result

The globbing pattern for folder/*.txt does not match files, but folder\*.txt does.

<nupkg>/
   TestPackage.nuspec
   dir2/
       test.txt

[nkolev92]

Merging issues:
Duplicate of #3584