Fix crash on opening jumplist (helix-editor#6672)

Co-authored-by: Esra Fokker <[email protected]>

helix-term/src/commands.rs

@@ -2549,6 +2549,13 @@ fn jumplist_picker(cx: &mut Context) {
         }
     }
 
+    for (view, _) in cx.editor.tree.views_mut() {
+        for doc_id in view.jumps.iter().map(|e| e.0).collect::<Vec<_>>().iter() {
+            let doc = doc_mut!(cx.editor, doc_id);
+            view.sync_changes(doc);
+        }
+    }
+
     let new_meta = |view: &View, doc_id: DocumentId, selection: Selection| {
         let doc = &cx.editor.documents.get(&doc_id);
         let text = doc.map_or("".into(), |d| {