fix: Widget disposal correctly now redirects focus

src/field_input_monkey_patch.js

@@ -0,0 +1,37 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as Blockly from 'blockly/core';
+
+function addTemporaryMarkFocusedOverrideToWorkspaceSvg() {
+  const oldWorkspaceSvgMarkFocused = Blockly.WorkspaceSvg.prototype.markFocused;
+
+  Blockly.WorkspaceSvg.prototype.markFocused = function() {
+    oldWorkspaceSvgMarkFocused.call(this);
+
+    // After the workspace's internal state is updated, ensure the correct
+    // container for keyboard navigation has focus. Note that this monkey patch is
+    // only overriding focus behavior for cases when a widget is being dispoed as
+    // there are other cases when focus needs to be correctly on the parent SVG
+    // (such as creating variables--see #136).
+    document.querySelector('.blocklyWorkspace').focus();
+    Blockly.WorkspaceSvg.prototype.markFocused = oldWorkspaceSvgMarkFocused;
+  }
+}
+
+const oldFieldNumberWidgetDispose = Blockly.FieldNumber.prototype.widgetDispose_;
+
+Blockly.FieldNumber.prototype.widgetDispose_ = function() {
+  oldFieldNumberWidgetDispose.call(this);
+  addTemporaryMarkFocusedOverrideToWorkspaceSvg();
+};
+
+const oldFieldTextInputWidgetDispose = Blockly.FieldTextInput.prototype.widgetDispose_;
+
+Blockly.FieldTextInput.prototype.widgetDispose_ = function() {
+  oldFieldTextInputWidgetDispose.call(this);
+  addTemporaryMarkFocusedOverrideToWorkspaceSvg();
+};

src/index.ts

@@ -90,10 +90,6 @@ export class KeyboardNavigation {
 
     workspace.getSvgGroup().addEventListener('focus', this.focusListener);
     workspace.getSvgGroup().addEventListener('blur', this.blurListener);
-    // Temporary workaround for #136.
-    // TODO(#136): fix in core.
-    workspace.getParentSvg().addEventListener('focus', this.focusListener);
-    workspace.getParentSvg().addEventListener('blur', this.blurListener);
   }
 
   /**

src/navigation_controller.ts

@@ -10,6 +10,7 @@
  * @author aschmiedt@google.com (Abby Schmiedt)
  */
 
+import './field_input_monkey_patch';
 import './gesture_monkey_patch';
 
 import * as Blockly from 'blockly/core';