RE: variable or function for list of known text properties?

[Drew Adams]

Sorry for the immediate follow-up. I meant to also suggest that a
text-property search could be added to isearch or at least realized in a way
similar to isearch. You would first input the property and value, and then
isearch would be limited to the text areas that had that property and value.

IOW, there is nothing that limits this text-property search idea to the kind
of searching that Icicles provides. An isearch version would also be useful.