Add more super and subscript characters to latin input methods

* lisp/leim/quail/latin-post.el ("latin-postfix", "latin-prefix"): Add
mssing super and subscript characters.  (Bug#55722)

lisp/leim/quail/latin-post.el

@@ -2247,6 +2247,8 @@ of characters from a single Latin-N charset.
   stroke     |    /    | d/ -> đ
   nordic     |    /    | d/ -> ð   t/ -> þ   a/ -> å   e/ -> æ   o/ -> ø
   symbols    |    ^    | r^ -> ®   t^ -> ™
+  super      |    ^    | 0^ -> ⁰   1^ -> ¹   +^ -> ⁺   -^ -> ⁻
+  subscript  |    _    | 0_ -> ₀   1_ -> ₁   +_ -> ₊   -_ -> ₋
   others     |    /    | s/ -> ß   ?/ -> ¿   !/ -> ¡   // -> °   o/ -> œ
              |    /    | 2/ -> ½   3/ -> ¾   4/ -> ?¼
              | various | << -> «   >> -> »   o_ -> º   a_ -> ª
@@ -2254,11 +2256,35 @@ of characters from a single Latin-N charset.
 Doubling the postfix separates the letter and postfix: e.g. a\\='\\=' -> a\\='
 " nil t nil nil nil nil nil nil nil nil t)
 
-;; Fixme: ¦ § ¨ © ¬ ­ ¯ ± ² ³ ´ µ ¶ · ¸ ¹ × ÷
+;; Fixme: ¦ § ¨ © ¬ ­ ¯ ± ´ µ ¶ · ¸ × ÷
 (quail-define-rules
  ("2/" ?½)
  ("3/" ?¾)
  ("4/" ?¼)
+ ("0^" ?⁰)
+ ("1^" ?¹)
+ ("2^" ?²)
+ ("3^" ?³)
+ ("4^" ?⁴)
+ ("5^" ?⁵)
+ ("6^" ?⁶)
+ ("7^" ?⁷)
+ ("8^" ?⁸)
+ ("9^" ?⁹)
+ ("+^" ?⁺)
+ ("-^" ?⁻)
+ ("0_" ?₀)
+ ("1_" ?₁)
+ ("2_" ?₂)
+ ("3_" ?₃)
+ ("4_" ?₄)
+ ("5_" ?₅)
+ ("6_" ?₆)
+ ("7_" ?₇)
+ ("8_" ?₈)
+ ("9_" ?₉)
+ ("+_" ?₊)
+ ("-_" ?₋)
  (" _" ? )
  ("!/" ?¡)
  ("//" ?°)
@@ -2453,6 +2479,30 @@ Doubling the postfix separates the letter and postfix: e.g. a\\='\\=' -> a\\='
  ("2//" ["2/"])
  ("3//" ["3/"])
  ("4//" ["4/"])
+ ("0^^" ["0^"])
+ ("1^^" ["1^"])
+ ("2^^" ["2^"])
+ ("3^^" ["3^"])
+ ("4^^" ["4^"])
+ ("5^^" ["5^"])
+ ("6^^" ["6^"])
+ ("7^^" ["7^"])
+ ("8^^" ["8^"])
+ ("9^^" ["9^"])
+ ("+^^" ["+^"])
+ ("-^^" ["-^"])
+ ("0__" ["0_"])
+ ("1__" ["1_"])
+ ("2__" ["2_"])
+ ("3__" ["3_"])
+ ("4__" ["4_"])
+ ("5__" ["5_"])
+ ("6__" ["6_"])
+ ("7__" ["7_"])
+ ("8__" ["8_"])
+ ("9__" ["9_"])
+ ("+__" ["+_"])
+ ("-__" ["-_"])
  (" __" [" _"])
  ("!//" ["!/"])
  ("///" ["//"])

lisp/leim/quail/latin-pre.el

@@ -1197,9 +1197,16 @@ of characters from a single Latin-N charset.
  ("\"w" ?ẅ)
  ("\"y" ?ÿ)
  ("^ " ?^)
+ ("^0" ?⁰)
  ("^1" ?¹)
  ("^2" ?²)
  ("^3" ?³)
+ ("^4" ?⁴)
+ ("^5" ?⁵)
+ ("^6" ?⁶)
+ ("^7" ?⁷)
+ ("^8" ?⁸)
+ ("^9" ?⁹)
  ("^A" ?Â)
  ("^C" ?Ĉ)
  ("^E" ?Ê)
@@ -1228,6 +1235,20 @@ of characters from a single Latin-N charset.
  ("^u" ?û)
  ("^w" ?ŵ)
  ("^y" ?ŷ)
+ ("^+" ?⁺)
+ ("^-" ?⁻)
+ ("_0" ?₀)
+ ("_1" ?₁)
+ ("_2" ?₂)
+ ("_3" ?₃)
+ ("_4" ?₄)
+ ("_5" ?₅)
+ ("_6" ?₆)
+ ("_7" ?₇)
+ ("_8" ?₈)
+ ("_9" ?₉)
+ ("_++" ?₊)
+ ("_-" ?₋)
  ("_+" ?±)
  ("_:" ?÷)
  ("_a" ?ª)