widgets: Add question for poll widget in the message itself.

Use the command '/poll question?', to start a question.

static/js/voting_widget.js

@@ -2,15 +2,15 @@ var voting_widget = (function () {
 
 var exports = {};
 
-var poll_data_holder = function (is_my_poll) {
+var poll_data_holder = function (is_my_poll, question) {
     // This object just holds data for a poll, although it
     // works closely with the widget's concept of how data
     // should be represented for rendering, plus how the
     // server sends us data.
     var self = {};
 
     var me = people.my_current_user_id();
-    var poll_question = '';
+    var poll_question = question;
     var key_to_comment = {};
     var my_idx = 1;
 
@@ -141,9 +141,10 @@ var poll_data_holder = function (is_my_poll) {
 exports.activate = function (opts) {
     var elem = opts.elem;
     var callback = opts.callback;
+    var question = opts.extra_data.question;
 
     var is_my_poll = people.is_my_user_id(opts.message.sender_id);
-    var poll_data = poll_data_holder(is_my_poll);
+    var poll_data = poll_data_holder(is_my_poll, question);
 
     function render() {
         var html = templates.render('poll-widget');

zerver/lib/widget.py

@@ -30,8 +30,11 @@ def do_widget_post_save_actions(message: MutableMapping[str, Any]) -> None:
 
     widget_type = None
     extra_data = None
-    if content in ['/poll', '/tictactoe']:
-        widget_type = content[1:]
+
+    tokens = content.split(' ')
+
+    if content in ['/tictactoe'] or tokens[0] in ['/poll']:
+        widget_type = tokens[0][1:]
 
     widget_content = message.get('widget_content')
     if widget_content is not None:
@@ -40,6 +43,12 @@ def do_widget_post_save_actions(message: MutableMapping[str, Any]) -> None:
         widget_type = widget_content['widget_type']
         extra_data = widget_content['extra_data']
 
+    if tokens[0] == '/poll' and extra_data is None:
+        question = ' '.join(tokens[1:])
+        if not question:
+            question = ''
+        extra_data = {'question': question}
+
     if widget_type:
         content = dict(
             widget_type=widget_type,