fix: Support now-focusable bubbles and icons.

Author: BenHenning

src/move_icon.ts

@@ -78,6 +78,13 @@ export class MoveIcon implements Blockly.IIcon, Blockly.IHasBubble {
     return true;
   }
 
+  /**
+   * Returns this icon's bubble.
+   */
+  getBubble(): Blockly.IBubble | null {
+    return this.moveIndicator;
+  }
+
   /**
    * Called when the location of this icon's block changes.
    *
@@ -111,4 +118,25 @@ export class MoveIcon implements Blockly.IIcon, Blockly.IHasBubble {
   async setBubbleVisible(visible: boolean) {}
 
   initView(pointerDownListener: (e: PointerEvent) => void) {}
+
+  /** See IFocusableNode.getFocusableElement. */
+  getFocusableElement(): HTMLElement | SVGElement {
+    throw new Error('This node is not focusable.');
+  }
+
+  /** See IFocusableNode.getFocusableTree. */
+  getFocusableTree(): Blockly.IFocusableTree {
+    throw new Error('This node is not focusable.');
+  }
+
+  /** See IFocusableNode.onNodeFocus. */
+  onNodeFocus(): void {}
+
+  /** See IFocusableNode.onNodeBlur. */
+  onNodeBlur(): void {}
+
+  /** See IFocusableNode.canBeFocused. */
+  canBeFocused(): boolean {
+    return false;
+  }
 }

src/move_indicator.ts

@@ -143,4 +143,25 @@ export class MoveIndicatorBubble
   revertDrag() {}
 
   setDeleteStyle(enable: boolean) {}
+
+  /** See IFocusableNode.getFocusableElement. */
+  getFocusableElement(): HTMLElement | SVGElement {
+    throw new Error('This node is not focusable.');
+  }
+
+  /** See IFocusableNode.getFocusableTree. */
+  getFocusableTree(): Blockly.IFocusableTree {
+    throw new Error('This node is not focusable.');
+  }
+
+  /** See IFocusableNode.onNodeFocus. */
+  onNodeFocus(): void {}
+
+  /** See IFocusableNode.onNodeBlur. */
+  onNodeBlur(): void {}
+
+  /** See IFocusableNode.canBeFocused. */
+  canBeFocused(): boolean {
+    return false;
+  }
 }