inactive-color for workspace shadows

[stella-sf]

As per the documentation:

(overview#workspace-shadow)

Control the shadow behind workspaces visible in the overview.

Settings here mirror the normal shadow config in the layout section, so check the documentation there.

(layout#shadow)

inactive-color lets you override the shadow color for inactive windows; by default, a more transparent color is used.

Reading this, I tried to set inactive-color for the workspace shadow, and was disappointed to see that it isnt allowed ("unexpected node"). Therefore my suggestion is that overview workspace-shadows should gain this option, which would apply to every workspace except the one currently "selected" in the overview. It would allow users to design a much more dynamic and integrated look for their overview that further mirrors the window design as well.