[Language Service] Fix project path on notebooks when running on Windows

source/pip/qsharp/_qsharp.py

@@ -161,7 +161,7 @@ def __init__(
             # In the future, we may support other schemes, such as github, if/when
             # we have VS Code Web + Jupyter support.
             normalized_root = os.path.normpath(os.path.join(os.getcwd(), project_root))
-            self._config["projectRoot"] = "file://" + normalized_root
+            self._config["projectRoot"] = "file:///" + normalized_root
 
     def __repr__(self) -> str:
         return "Q# initialized with configuration: " + str(self._config)

source/vscode/src/projectSystem.ts

@@ -105,7 +105,14 @@ export async function listDirectory(
 
   const fileSearchResult = await vscode.workspace.fs.readDirectory(uriToQuery);
   const mappedFiles: [string, vscode.FileType][] = fileSearchResult.map(
-    ([name, type]) => [Utils.joinPath(uriToQuery, name).toString(), type],
+    ([name, type]) => [
+      // Rust expects paths, not encoded URIs, so we need to decode here.
+      // We need to decode the components and then the URI.
+      decodeURI(
+        decodeURIComponent(Utils.joinPath(uriToQuery, name).toString()),
+      ),
+      type,
+    ],
   );
 
   return mappedFiles;