include blocks in the "scripts pic" export if it is a single one

HISTORY.md

@@ -65,6 +65,7 @@
 ### 2022-07-30
 * Greek translation update, thank you, HM100!!
 * blocks: include custom block definition in the "scripts pic" of the block editor
+* blocks: include script xml (blocks) in the "scripts pic" export if it is a single one
 
 ### 2022-07-23
 * throttle framerate to < 67 fps

src/blocks.js

@@ -8144,7 +8144,8 @@ ScriptsMorph.prototype.scriptsPicture = function () {
 ScriptsMorph.prototype.scriptsXML = function () {
     // private - answer a container (usually sprite) for all scripts
     var blockEditor = this.parentThatIsA(BlockEditorMorph),
-        ide = this.world().children[0];
+        ide = this.world().children[0],
+        scripts = this.children.filter(m => m instanceof BlockMorph);
     if (blockEditor) {
         return ide.blocksLibraryXML(
             [blockEditor.definition].concat(
@@ -8158,6 +8159,9 @@ ScriptsMorph.prototype.scriptsXML = function () {
             true
         );
     }
+    if (scripts.length === 1) {
+        return scripts[0].toXMLString();
+    }
     return null; // +++ for now
 };