widget: Add handling for updating TODO title.

Updated tests.

Author: rsashank

tests/widget/test_widget.py

@@ -259,6 +259,48 @@ def test_find_widget_type(submessage: Any, expected_widget_type: str) -> None:
             },
             id="todo_with_title_and_description_and_some_tasks_completed",
         ),
+        case(
+            [
+                {
+                    "id": 12143,
+                    "message_id": 1958318,
+                    "sender_id": 27294,
+                    "msg_type": "widget",
+                    "content": '{"widget_type": "todo", "extra_data": {'
+                    '"task_list_title": "Today\'s Work", "tasks": [{"task": '
+                    '"Update todo titles on ZT", "desc": ""}, '
+                    '{"task": "Push todo update", "desc": ""}]}}',
+                },
+                {
+                    "id": 12144,
+                    "message_id": 1958318,
+                    "sender_id": 27294,
+                    "msg_type": "widget",
+                    "content": '{"type":"new_task_list_title",'
+                    '"title":"Today\'s Work [Updated]"}',
+                },
+                {
+                    "id": 12145,
+                    "message_id": 1958318,
+                    "sender_id": 27294,
+                    "msg_type": "widget",
+                    "content": '{"type":"strike","key":"0,canned"}',
+                },
+            ],
+            "Today's Work [Updated]",
+            {
+                "0,canned": {
+                    "task": "Update todo titles on ZT",
+                    "desc": "",
+                    "completed": True,
+                },
+                "1,canned": {
+                    "task": "Push todo update",
+                    "desc": "",
+                    "completed": False,
+                },
+            },
+        ),
     ],
 )
 def test_process_todo_widget(

zulipterminal/widget.py

@@ -60,4 +60,7 @@ def process_todo_widget(todo_list: Any) -> Tuple[str, Dict[str, Dict[str, Any]]]
                 if task_id in tasks:
                     tasks[task_id]["completed"] = not tasks[task_id]["completed"]
 
+            elif widget.get("type") == "new_task_list_title":
+                title = widget["title"]
+
     return title, tasks