Changelog

Version: 1.1.2
  Bugfixes:
    - Updated the furnace recipe to use RecipePrototype.categories for Factorio 2.1 compatibility.

Version: 1.1.1
  Changes:
    - Ported the completed 1.0.11 heat-pipe cap implementation to Factorio and Space Age 2.1.
    - Preserves full-colour, full-opacity cap artwork above the unchanged furnace heat and graphics layers.
    - Removed unused prototype imports for 2.1 compatibility.

Version: 1.0.11
  Changes:
    - Added connection-driven heat-pipe caps that appear on open furnace connections and disappear individually when connected.
    - Draws the original cap artwork above the furnace at full colour and opacity, unaffected by temperature.
    - Preserves the furnace's original heat picture, glow behaviour, graphics layers, and established cap positions.
    - Uses event-driven connection updates with a low-frequency safety check for scripted changes.

Version: 1.0.0
  Changes:
    - Initial release.