Bug Fix: REPL reuse and do not overwrite Jupyter's IW title (#23530)

Resolves: microsoft#23518

Should resolve issue where opening Python REPL -> opening Jupyter IW ->
sending commands to REPL were happening instead of reusing existing
Python REPL

Also seems to resolve issue where Python REPL was overwriting to
Jupyter's IW title.

Switching to watch onDidCloseNotebook event as suggested.

Author: anthonykim1

src/client/repl/replCommands.ts

@@ -54,9 +54,8 @@ function getSendToNativeREPLSetting(): boolean {
     return configuration.get<boolean>('REPL.sendToNativeREPL', false);
 }
 
-window.onDidChangeVisibleTextEditors((editors) => {
-    const interactiveWindowIsOpen = editors.some((editor) => editor.document.uri.scheme === 'vscode-interactive-input');
-    if (!interactiveWindowIsOpen) {
+workspace.onDidCloseNotebookDocument((nb) => {
+    if (notebookDocument && nb.uri.toString() === notebookDocument.uri.toString()) {
         notebookEditor = undefined;
         notebookDocument = undefined;
     }