Build the dropdown options for the "sync to slider" feature: a map of human-readable dimension name → dimension index, restricted to non-displayed dimensions. Returns a (no dimensions) placeholder mapped to -1 if every dim is currently displayed.
(no dimensions)
-1
Build the dropdown options for the "sync to slider" feature: a map of human-readable dimension name → dimension index, restricted to non-displayed dimensions. Returns a
(no dimensions)placeholder mapped to-1if every dim is currently displayed.