Isearch has a couple of toggles like case-fold, isearch-invisible and now char-fold.
After updating, I noticed that the prompt for the regular `C-s` is now "Char-fold Isearch: ".
Should that "Char-fold" prefix be there? If so, we should also display what other isearch options are in effect (case-fold, etc).
- The prefix be kept the same as before ("Isearch: ") for brevity.
- The moment a user starts Isearch (or when user calls a command during Isearch using some binding), the effective isearch properties are flashed in the echo area. That "flashing" would look just as the case-sensitivity state is flashed on hitting `M-c` during isearch. An example of such flashed message could be
[Case-fold: on Char-fold: on Search-invisible: off]
- If we don't want to flash that message, the message can be displayed and be allowed to stay there till user starts/resumes typing in the minibuffer.