Re: char equivalence classes in search - why not symmetric?

[Juri Linkov]

> That is, after you figure out that Emacs has turned the tables on
> you (and there is no signal that it has - no message telling you
> that it is now searching case-sensitively),

For the automatic toggling of case-sensitivity we could display the same
message as displayed for manual toggling with ‘M-s c’.

> IOW, the automatic downcasing DWIM is used only when you use `C-M-y'
> (or `C-w') to yank some text at point into the search string.  What
> was said about automatic downcasing is not true for pasting in
> general.  Which points to another possibility of use confusion
> (inconsistency).

No, pasting is broken too: try to paste the upper case “A” with ‘C-s
C-y’ (isearch-yank-kill) - it's irrecoverably converted to lower case.