'Edit Color Group' does not respect global or spot color swatches.
The 'edit color group' tool is a neat little palette explorer, but in practice I never use it because my workflow is centered around global swatches, and it completely ignores that.
- Make a few global color swatches. Draw some shapes using them.
- Double-click on one of those swatches, play with the sliders, notice that everything drawn in it changes to match.
- Make those swatches into a color group.
- Select the color group and hit the 'Edit Color Group' button in the Swatches palette.
- Change some colors, hit OK, yes you do want to save your changes to the swatch group.
- Observe that every swatch you just changed is now non-global, and all art drawn in those formerly-global swatches is now unlinked from the swatches.
- Do the same thing again except substitute 'spot color' for 'global color'; observe the similar effects.
IMHO, Illustrator should preserve the global/spot status of swatches when using this tool.
And given that it's failed to do this for a while and people have built workflow expectations around this behavior I am completely fine with an 'Edit Color Group preserves spot/global swatches' switch somewhere that defaults to off, if you're worried about people screaming about this. in the next version. :)