From c52b2306e980f4e4ac26d14992a0cfde9d9189f2 Mon Sep 17 00:00:00 2001
From: Mario Buikhuizen <mariobuikhuizen@widgetti.io>
Date: Mon, 27 Nov 2023 15:53:24 +0100
Subject: [PATCH] fix: restoring widgets from saved state is broken since v8

In 9d999d7b waiting for sessionContext.ready was removed, this
caused _loadNotebook() not to work, because it was called before the
widget metadata was available.

This commit restores waiting for sessionContext.ready. This has
to be before _loadFromKernel(), otherwise this.kernel is not
present, causing an exeption, skipping _loadNotebook().

Fixes: https://github.com/jupyterlab/jupyterlab/issues/15361
---
 python/jupyterlab_widgets/src/manager.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/python/jupyterlab_widgets/src/manager.ts b/python/jupyterlab_widgets/src/manager.ts
index 9ee14d76fc..fec2cb3e4e 100644
--- a/python/jupyterlab_widgets/src/manager.ts
+++ b/python/jupyterlab_widgets/src/manager.ts
@@ -496,6 +496,7 @@ export class WidgetManager extends LabWidgetManager {
     { loadKernel, loadNotebook } = { loadKernel: true, loadNotebook: true }
   ): Promise<void> {
     try {
+      await this.context.sessionContext.ready;
       if (loadKernel) {
         try {
           this._kernelRestoreInProgress = true;