Visual Studio File Nesting for gRPC proto files - visual-studio

Question

I have a load of .proto files that generate an associated .cs file, and i also have a partial .cs file, all of the same name:
message.proto
message.cs (autogenerated in the obj\debug
directory)
mesasge.cs (in the same folder as the proto file)
I am trying to get them nesting with Visual Studio 2019, but unable. Pointers much appreciated as to what i am doing wrong.
{
"help": "https://go.microsoft.com/fwlink/?linkid=866610",
"root": true,
"dependentFileProviders": {
"add": {
"addedExtension": {},
"pathSegment": {
"add": {
".*": [
".js",
".css",
".html",
".htm",
".less",
".scss",
".coffee",
".iced",
".config",
".cs",
".vb",
".json",
".proto"
]
}
},
"extensionToExtension": {
"add": {
".proto": [
".cs"
],
".js": [
".coffee",
".iced",
".ts",
".tsx",
".jsx"
],
".css": [
".less",
".scss",
".sass",
".styl"
],
".html": [
".md",
".mdown",
".markdown",
".mdwn"
],
".map": [
".js",
".css"
],
".svgz": [
".svg"
],
".designer.cs": [
".resx"
],
".cs.d.ts": [
".cs"
]
}
},
"fileToFile": {
"add": {
".bowerrc": [
"bower.json"
],
".npmrc": [
"package.json"
],
"npm-shrinkwrap.json": [
"package.json"
],
"yarn.lock": [
"package.json"
],
".yarnclean": [
"package.json"
],
".yarnignore": [
"package.json"
],
".yarn-integrity": [
"package.json"
],
".yarnrc": [
"package.json"
],
"package-lock.json": [
"package.json"
]
}
},
"fileSuffixToExtension": {
"add": {
"-vsdoc.js": [
".js"
]
}
},
"allExtensions": {
"add": {
".*": [
".tt"
]
}
}
}
}
}