View by Fill Color

Topic fill colours are used less frequently than icons or tags for visual mark-up, but have two advantages:

• They don't make the map bigger or increase the visual clutter.
• The fill colour is assigned with a Topic Style, while icons and tags are not.

It would be good to have a View by Fill Colour (like the Icon and Tag views), so that topics can be quickly sorted by named colour. If a fill colour has been given a name in the Map Index, it would be helpful to show this as a tooltip when hovering over the topic, in the same way that Icon marker names are shown.