Centralize retained drag capture release

src/node_panel_grid.cpp

@@ -497,7 +497,7 @@ void NodePanelGrid::bake_uvs()
         std::this_thread::sleep_for(std::chrono::milliseconds(100));
     }
     worker.join();
-    pb->destroy();
+    pp::panopainter::close_legacy_dialog_node(*pb);
     //stbi_write_jpg("bake-out.jpg", fb.getWidth(), fb.getHeight(), 4, data_out.get(), 75);
     m_texture.update(data_out.get());
     m_texture.create_mipmaps();
@@ -558,7 +558,7 @@ kEventResult NodeHeightmapOverlay::handle_event(Event* e)
     }
     break;
     case kEventType::MouseUpL:
-        mouse_release();
+        pp::panopainter::release_legacy_mouse_capture(*this);
         dragging = false;
         break;
     case kEventType::MouseMove:
@@ -573,7 +573,7 @@ kEventResult NodeHeightmapOverlay::handle_event(Event* e)
         }
         break;
     case kEventType::MouseCancel:
-        mouse_release();
+        pp::panopainter::release_legacy_mouse_capture(*this);
         dragging = false;
         m_value = m_old_value;
         set_value(m_value.x, m_value.y);