Method getLayer

src/app/ui/editor/tool_loop_impl.cpp:196–196

  Document* getDocument() override { return m_document; }
  Sprite* sprite() override { return m_sprite; }
  Layer* getLayer() override { return m_layer; }
  frame_t getFrame() override { return m_frame; }
  RgbMap* getRgbMap() override {
    if (!m_rgbMap) {