code: Compare the string representation of URIs

For some reason, the object representation of the same URI is not stable
leading to synchronised scrolling breaking after scrolling the preview
window.

Instead, compare the string representation of the uris which should
work around the differences that should not matter.

code/changes/875.fix.md

@@ -0,0 +1 @@
+Ensure scrolling is still synchronised, even after scrolling the preview window

code/src/node/preview.ts

@@ -78,7 +78,10 @@ export class PreviewManager {
   }
 
   private scrollView(editor: vscode.TextEditor) {
-    if (editor.document.uri !== this.currentUri) {
+    // For some reason, the object representation of the same URI is not stable
+    // leading this check to fail in cases where it should pass.
+    // Instead, compare the string representation of the uris.
+    if (editor.document.uri.toString() !== this.currentUri?.toString()) {
       return
     }