ASK nothing or a falsy value terminates the thread currently displaying a question

HISTORY.md

@@ -4,6 +4,7 @@
 * **New Features:**
     * passing a list to the ASK command in sensing presents a menu to the user
     * formatting a list of texts displays it as chat-history in an ASK menu
+    * ASK nothing or a falsy value terminates the thread currently displaying a question
     * new "Menus" library
     * export script (including dependencies) via its context menu
     * export / import sprite-local custom block definitions from the palette
@@ -39,6 +40,9 @@
 * **Translation Updates:**
     * German
 
+### 2022-04-19
+* threads: ASK nothing or a falsy value terminates the thread currently displaying a question
+
 ### 2022-04-08
 * blocks, threads: added new "label" selector to OF BLOCK's block dropdown
 * German translation update for "label"

snap.html

@@ -17,7 +17,7 @@
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-17-09"></script>
         <script src="src/blocks.js?version=2022-04-08"></script>
-        <script src="src/threads.js?version=2022-04-08"></script>
+        <script src="src/threads.js?version=2022-04-19"></script>
         <script src="src/objects.js?version=2022-04-04"></script>
         <script src="src/scenes.js?version=2022-03-03"></script>
         <script src="src/gui.js?version=2022-04-06"></script>

src/threads.js

@@ -65,7 +65,7 @@ StagePickerMorph*/
 
 /*jshint esversion: 6, bitwise: false, evil: true*/
 
-modules.threads = '2022-April-08';
+modules.threads = '2022-April-19';
 
 var ThreadManager;
 var Process;
@@ -3699,6 +3699,13 @@ Process.prototype.doAsk = function (data) {
                 this.prompter.inputField.edit();
                 stage.changed();
             }
+        } else if (!data) {
+            // terminate the processes currently asking a question
+            // making way for the next one waiting to ask one
+            stage.threads.processes.filter(proc =>
+                proc.prompter && !proc.prompter.isDone
+            ).forEach(proc => proc.stop());
+            return;
         }
     } else {
         if (this.prompter.isDone) {