bug#12988: [PATCH] RE: bug#12988: isearch fails to persistently indicate case sensitivity

[Juri Linkov]

>>>> I think that would be fine, though full strings (like "case",
>>>> "strict-space") might be better than cryptic acryonyms.
>>> In an earlier thread I suggested "Isearch/w/c" where the letters would
>>> match the keys used to enable/select those options.
>> The problem is that some of these keys are not alphanumeric,
>> thus not easily recognizable when displayed in the prompt.
>
> Which non-alphanumeric keys are you thinking about?

For example, the space character `M-s SPC' that toggles lax-whitespace mode,
or the underscore character `M-s _' that toggles symbol mode.  A prompt like
"Isearch/ /_" cannot be easily deciphered.