I could have sworn I did this before in Inkscape but I can't remember or find any way to do it now.

is there some way to select all objects that have the same fill and/or stroke?

was it just a dream?

have I been sucked into a timewarp? Was I using Inkscape 4.8?

druban wrote:is there some way to select all objects that have the same fill and/or stroke?

Described in this topic for example: finding similar objects

druban wrote:have I been sucked into a timewarp? Was I using Inkscape 4.8?

No :) - it was in 0.46 already, maybe even earlier.