Problem with UTF-8 input in isearch

[whizse]

Hi,

I'm having trouble using isearch with UTF-8 characters, specifically the characters å, ä, ö. Any of these are ignored as input.

Here's a minimal example to recreate the problem:

(popup-menu* '("Öland" "Åland" "Älvan") :isearch t)

It's impossible to narrow down the two first choices with isearch since the first character is ignored and only the string "land" is used as a match.

Using Emacs 27.1 and popup-el 0.5.8.

[jcs090218]

I can reproduce this issue. I would mark this with bug label for now.