cubicweb-saem_ref #12535198 search high-light doesn't work if case doesn't match [rejected]

eg search for a word in lower case, if it appears in upper case in the original document it won't be highlighted (eg search for abzac on the demo).

prioritynormal
typebug
done in0.11.0
load0.000
load left0.000
closed by<not specified>