Fix msbuild failing when '@' is present in path #31133
Merged
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Fix for #30746 - "C# Protobuf msbuild task fails with glob pattern if "@" is present in the path"
There was ambiguity in references to
%(Source)
metadata on some items. These are now qualified to remove the ambiguity. This is what was causing the problems when there was a '@' in the path to the proto files.Also fix the printing of the warning for 'no known outputs' - it was using the wrong item list so no file names where output.
Testing on Windows and Linux on various Grpc projects.