MDL-77897 editor_tiny: Save editor content on editor blur

lib/editor/tiny/amd/src/editor.js

@@ -447,6 +447,11 @@ export const setupForTarget = async(target, options = {}) => {
         });
     }
 
+    // Save the editor content to the textarea when the editor is blurred.
+    editor.on('blur', () => {
+        editor.save();
+    });
+
     pendingPromise.resolve();
     return editor;
 };