bug#37051: 26.2.90; feature request: C-x 8 <SYMBOL> Prefix Command for letter with macron

[VanL]

Hello,

There doesn't seem to be a Prefix Command for placing a macron over a small 
letter 'a'. [1]

Like typing `C-x 8 ^ a  â' to place a circumflex over a small letter a, I'd 
like to be able to type the 'a' and 'i' with macron in 'Cháng Xiāng Sī 
(Everlasting Longing) by Bai Juyi'.

--
[1] output from C-x 8 C-h follows

Key translations Starting With C-x 8:
key             binding
---             -------

C-x 8 SPC        
C-x 8 !         ¡
C-x 8 "         Prefix Command
C-x 8 $         ¤
C-x 8 '         Prefix Command
C-x 8 *         Prefix Command
C-x 8 +         ±
C-x 8 ,         Prefix Command
C-x 8 -         ­
C-x 8 .         ·
C-x 8 /         Prefix Command
C-x 8 1         Prefix Command
C-x 8 2         Prefix Command
C-x 8 3         Prefix Command
C-x 8 <         «
C-x 8 =         ¯
C-x 8 >         »
C-x 8 ?         ¿
C-x 8 C         ©
C-x 8 L         £
C-x 8 N         Prefix Command
C-x 8 P         ¶
C-x 8 R         ®
C-x 8 S         §
C-x 8 Y         ¥
C-x 8 [         ‘
C-x 8 ]         ’
C-x 8 ^         Prefix Command
C-x 8 _         Prefix Command
C-x 8 `         Prefix Command
C-x 8 a         Prefix Command
C-x 8 c         ¢
C-x 8 m         µ
C-x 8 o         °
C-x 8 u         µ
C-x 8 x         ×
C-x 8 {         “
C-x 8 |         ¦
C-x 8 }         ”
C-x 8 ~         Prefix Command

C-x 8 a <       ←
C-x 8 a =       ↔
C-x 8 a >       →

C-x 8 N o       №

C-x 8 2 +       ‡

C-x 8 ~ SPC     ~
C-x 8 ~ =       ≈
C-x 8 ~ A       Ã
C-x 8 ~ D       Ð
C-x 8 ~ N       Ñ
C-x 8 ~ O       Õ
C-x 8 ~ T       Þ
C-x 8 ~ a       ã
C-x 8 ~ d       ð
C-x 8 ~ n       ñ
C-x 8 ~ o       õ
C-x 8 ~ t       þ
C-x 8 ~ ~       ¬

C-x 8 ` SPC     `
C-x 8 ` A       À
C-x 8 ` E       È
C-x 8 ` I       Ì
C-x 8 ` O       Ò
C-x 8 ` U       Ù
C-x 8 ` a       à
C-x 8 ` e       è
C-x 8 ` i       ì
C-x 8 ` o       ò
C-x 8 ` u       ù

C-x 8 _ -       −
C-x 8 _ <       ≤
C-x 8 _ >       ≥
C-x 8 _ H       ‑
C-x 8 _ a       ª
C-x 8 _ f       ‒
C-x 8 _ h       ‐
C-x 8 _ m       —
C-x 8 _ n       –
C-x 8 _ o       º
C-x 8 _ q       ―

C-x 8 ^ SPC     ^
C-x 8 ^ 1       ¹
C-x 8 ^ 2       ²
C-x 8 ^ 3       ³
C-x 8 ^ A       Â
C-x 8 ^ E       Ê
C-x 8 ^ I       Î
C-x 8 ^ O       Ô
C-x 8 ^ U       Û
C-x 8 ^ a       â
C-x 8 ^ e       ê
C-x 8 ^ i       î
C-x 8 ^ o       ô
C-x 8 ^ u       û

C-x 8 3 /       Prefix Command

C-x 8 1 +       †
C-x 8 1 /       Prefix Command

C-x 8 / /       ÷
C-x 8 / =       ≠
C-x 8 / A       Å
C-x 8 / E       Æ
C-x 8 / O       Ø
C-x 8 / a       å
C-x 8 / e       æ
C-x 8 / o       ø

C-x 8 , ,       ¸
C-x 8 , C       Ç
C-x 8 , c       ç

C-x 8 ' SPC     '
C-x 8 ' '       ´
C-x 8 ' A       Á
C-x 8 ' E       É
C-x 8 ' I       Í
C-x 8 ' O       Ó
C-x 8 ' U       Ú
C-x 8 ' Y       Ý
C-x 8 ' a       á
C-x 8 ' e       é
C-x 8 ' i       í
C-x 8 ' o       ó
C-x 8 ' u       ú
C-x 8 ' y       ý

C-x 8 " SPC     "
C-x 8 " "       ¨
C-x 8 " A       Ä
C-x 8 " E       Ë
C-x 8 " I       Ï
C-x 8 " O       Ö
C-x 8 " U       Ü
C-x 8 " a       ä
C-x 8 " e       ë
C-x 8 " i       ï
C-x 8 " o       ö
C-x 8 " s       ß
C-x 8 " u       ü
C-x 8 " y       ÿ

C-x 8 * SPC      
C-x 8 * !       ¡
C-x 8 * "       ″
C-x 8 * $       ¤
C-x 8 * '       ′
C-x 8 * *       •
C-x 8 * +       ±
C-x 8 * -       ­
C-x 8 * .       ·
C-x 8 * <       «
C-x 8 * =       ¯
C-x 8 * >       »
C-x 8 * ?       ¿
C-x 8 * C       ©
C-x 8 * E       €
C-x 8 * L       £
C-x 8 * P       ¶
C-x 8 * R       ®
C-x 8 * S       §
C-x 8 * Y       ¥
C-x 8 * c       ¢
C-x 8 * m       µ
C-x 8 * o       °
C-x 8 * u       µ
C-x 8 * x       ×
C-x 8 * |       ¦

C-x 8 3 / 4     ¾

C-x 8 1 / 2     ½
C-x 8 1 / 4     ¼

Global Bindings Starting With C-x 8:
key             binding
---             -------

C-x 8 RET       insert-char

[forward]