make drive comparison case-insensitive.

editors/code/src/notifications/publish_decorations.ts

@@ -10,10 +10,19 @@ export interface PublishDecorationsParams {
 
 export function handle(params: PublishDecorationsParams) {
     const targetEditor = vscode.window.visibleTextEditors.find(
-        editor => editor.document.uri.toString() === params.uri,
+        editor => {
+            const unescapedUri = unescape(editor.document.uri.toString());
+            // Unescaped URI should be something like:
+            // file:///c:/Workspace/ra-test/src/main.rs
+            // RA server might send it with the drive letter uppercased, so we force only the drive letter to lowercase.
+            const uriWithLowercasedDrive = params.uri.substr(0, 8) + params.uri[8].toLowerCase() + params.uri.substr(9);
+            return unescapedUri === uriWithLowercasedDrive
+        }
     );
+
     if (!Server.config.highlightingOn || !targetEditor) {
         return;
     }
+
     Server.highlighter.setHighlights(targetEditor, params.decorations);
 }