bug#52173: `Å›' character not available using `C-x 8'

[Juri Linkov]

>> Would you please present an argument in favor of the change?
>> There might be a good reason, I just didn't see one stated here.
>
> `C-x 8 .' is useful for a prefix for a number of characters that we
> might want to add in the future.

Here's a list of characters that could be added for the prefix ".":

grep "(\"\." lisp/leim/quail/compose.el
 (".>" ?›)
 (".<" ?‹)
 (".." ?…)
 (".-" ?·)
 (".^" ?·)
 (".=" ?•)
 (".C" ?Ċ)
 (".c" ?ċ)
 (".E" ?Ė)
 (".e" ?ė)
 (".G" ?Ġ)
 (".g" ?ġ)
 (".I" ?İ)
 (".i" ?ı)
 (".Z" ?Ż)
 (".z" ?ż)
 (".A" ?Ȧ)
 (".a" ?ȧ)
 (".O" ?Ȯ)
 (".o" ?ȯ)
 (".B" ?Ḃ)
 (".b" ?ḃ)
 (".D" ?Ḋ)
 (".d" ?ḋ)
 (".F" ?Ḟ)
 (".f" ?ḟ)
 (".H" ?Ḣ)
 (".h" ?ḣ)
 (".M" ?Ṁ)
 (".m" ?ṁ)
 (".N" ?Ṅ)
 (".n" ?ṅ)
 (".P" ?Ṗ)
 (".p" ?ṗ)
 (".R" ?Ṙ)
 (".r" ?ṙ)
 (".S" ?Ṡ)
 (".s" ?ṡ)
 (".Ś" ?Ṥ)
 (".´S" ?Ṥ)
 (".'S" ?Ṥ)
 (".ś" ?ṥ)
 (".´s" ?ṥ)
 (".'s" ?ṥ)
 (".Š" ?Ṧ)
 (".š" ?ṧ)
 (".Ṣ" ?Ṩ)
 (".!S" ?Ṩ)
 (".ṣ" ?ṩ)
 (".!s" ?ṩ)
 (".T" ?Ṫ)
 (".t" ?ṫ)
 (".W" ?Ẇ)
 (".w" ?ẇ)
 (".X" ?Ẋ)
 (".x" ?ẋ)
 (".Y" ?Ẏ)
 (".y" ?ẏ)
 (".ſ" ?ẛ)
 (".○" ?⊙)
 (".:" ?∵)