bug#15273: 24.3.50; Combining character sequences are displayed weirdly

[Xue Fuqiao <xfq.free@gmail.com>]

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I've attached my "C-u C-x =" information.

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The first group:

--------------------------------------------------------------------------------------------------------------------------------------
             position: 1 of 1217 (0%), column: 0
            character: ã (displayed as ã) (codepoint 227, #o343, #xe3)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0xE3
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), j:Japanese, l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC3 #xA3
            file code: #xC3 #xA3 (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1 (#xA5)

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH TILDE
  old-name: LATIN SMALL LETTER A TILDE
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 771) ('a' '̃')

             position: 38 of 1217 (3%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ã" (see below)

Composed with the following character(s) "̃" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 97 68 7 0 8 6 0 nil]
  [0 1 771 692 2 -7 6 1 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The second group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 84 of 1217 (7%), column: 0
            character: ȧ (displayed as ȧ) (codepoint 551, #o1047, #x227)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x0227
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), l:Latin
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC8 #xA7
            file code: #xC8 #xA7 (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1 (#x1E9)

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH DOT ABOVE
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 775) ('a' '̇')

             position: 125 of 1217 (10%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ȧ" (see below)

Composed with the following character(s) "̇" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 97 68 7 0 8 6 0 nil]
  [0 1 775 696 2 -6 3 2 0 [-2 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The third group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 175 of 1217 (14%), column: 0
            character: ã (displayed as ã) (codepoint 227, #o343, #xe3)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0xE3
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), j:Japanese, l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC3 #xA3
            file code: #xC3 #xA3 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̃" (see below)

Composed with the following character(s) "̣" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 227 165 7 0 8 9 0 nil]
  [0 1 803 724 2 -6 3 0 2 [-2 1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH TILDE
  old-name: LATIN SMALL LETTER A TILDE
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 771) ('a' '̃')

             position: 235 of 1217 (19%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̃" (see below)

Composed with the following character(s) "̣̃" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 771 692 2 -7 6 1 0 [-3 0 0]]
  [0 2 803 724 2 -6 3 0 2 [-2 1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')

             position: 303 of 1217 (25%), column: 0
            character: ạ (displayed as ạ) (codepoint 7841, #o17241, #x1ea1)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x1EA1
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xE1 #xBA #xA1
            file code: #xE1 #xBA #xA1 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̃" (see below)

Composed with the following character(s) "̃" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 7841 2458 7 0 8 6 2 nil]
  [0 1 771 692 2 -7 6 1 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH DOT BELOW
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 803) ('a' '̣')

             position: 363 of 1217 (30%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̃" (see below)

Composed with the following character(s) "̣̃" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 803 724 2 -6 3 0 2 [-2 1 0]]
  [0 2 771 692 2 -7 6 1 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The fourth group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 432 of 1217 (35%), column: 0
            character: ạ (displayed as ạ) (codepoint 7841, #o17241, #x1ea1)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x1EA1
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xE1 #xBA #xA1
            file code: #xE1 #xBA #xA1 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̇" (see below)

Composed with the following character(s) "̇" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 7841 2458 7 0 8 6 2 nil]
  [0 1 775 696 2 -6 3 2 0 [-2 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH DOT BELOW
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 803) ('a' '̣')

             position: 496 of 1217 (41%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̇" (see below)

Composed with the following character(s) "̣̇" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 803 724 2 -6 3 0 2 [-2 1 0]]
  [0 2 775 696 2 -6 3 2 0 [-2 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')

             position: 568 of 1217 (47%), column: 0
            character: ȧ (displayed as ȧ) (codepoint 551, #o1047, #x227)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x0227
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), l:Latin
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC8 #xA7
            file code: #xC8 #xA7 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̇" (see below)

Composed with the following character(s) "̣" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 551 489 7 0 8 9 0 nil]
  [0 1 803 724 2 -6 3 0 2 [-2 1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH DOT ABOVE
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 775) ('a' '̇')

             position: 632 of 1217 (52%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ạ̇" (see below)

Composed with the following character(s) "̣̇" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 775 696 2 -6 3 2 0 [-2 0 0]]
  [0 2 803 724 2 -6 3 0 2 [-2 1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The fifth group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 705 of 1217 (58%), column: 0
            character: ấ (displayed as ấ) (codepoint 7845, #o17245, #x1ea5)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x1EA5
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xE1 #xBA #xA5
            file code: #xE1 #xBA #xA5 (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1 (#x99E)

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH CIRCUMFLEX AND ACUTE
  general-category: Ll (Letter, Lowercase)
  decomposition: (226 769) ('â' '́')

             position: 757 of 1217 (62%), column: 0
            character: â (displayed as â) (codepoint 226, #o342, #xe2)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0xE2
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), j:Japanese, l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC3 #xA2
            file code: #xC3 #xA2 (encoded by coding system utf-8-unix)
              display: composed to form "ấ" (see below)

Composed with the following character(s) "́" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 226 164 7 0 8 9 0 nil]
  [0 1 769 690 2 -6 5 2 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH CIRCUMFLEX
  old-name: LATIN SMALL LETTER A CIRCUMFLEX
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 770) ('a' '̂')

             position: 825 of 1217 (68%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "ấ" (see below)

Composed with the following character(s) "̂́" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 770 691 2 -7 6 2 0 [-3 0 0]]
  [0 2 769 690 2 -6 5 2 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The sixth group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 909 of 1217 (75%), column: 0
            character: á (displayed as á) (codepoint 225, #o341, #xe1)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0xE1
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), c:Chinese, j:Japanese, l:Latin, v:Viet
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xC3 #xA1
            file code: #xC3 #xA1 (encoded by coding system utf-8-unix)
              display: composed to form "á̂" (see below)

Composed with the following character(s) "̂" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 1 225 163 7 0 8 9 0 nil]
  [0 1 770 691 2 -7 6 2 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A WITH ACUTE
  old-name: LATIN SMALL LETTER A ACUTE
  general-category: Ll (Letter, Lowercase)
  decomposition: (97 769) ('a' '́')

             position: 972 of 1217 (80%), column: 0
            character: a (displayed as a) (codepoint 97, #o141, #x61)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x61
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #x61
            file code: #x61 (encoded by coding system utf-8-unix)
              display: composed to form "á̂" (see below)

Composed with the following character(s) "́̂" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 97 68 7 0 8 6 0 nil]
  [0 2 769 690 2 -6 5 2 0 [-3 0 0]]
  [0 2 770 691 2 -7 6 2 0 [-3 0 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER A
  general-category: Ll (Letter, Lowercase)
  decomposition: (97) ('a')
--------------------------------------------------------------------------------------------------------------------------------------

The last group:
--------------------------------------------------------------------------------------------------------------------------------------
             position: 1056 of 1217 (87%), column: 0
            character: α (displayed as α) (codepoint 945, #o1661, #x3b1)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x03B1
               script: greek
               syntax: w 	which means: word
             category: .:Base, G:2-byte Greek, L:Left-to-right (strong), c:Chinese, g:Greek, h:Korean, j:Japanese
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xCE #xB1
            file code: #xCE #xB1 (encoded by coding system utf-8-unix)
              display: composed to form "ἄ" (see below)

Composed with the following character(s) "̓́" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 945 837 8 0 9 6 0 nil]
  [0 2 787 708 2 -6 3 2 0 [-3 0 0]]
  [0 2 769 690 2 -6 5 2 0 [-4 0 0]]

Character code properties: customize what to show
  name: GREEK SMALL LETTER ALPHA
  general-category: Ll (Letter, Lowercase)
  decomposition: (945) ('α')

             position: 1137 of 1217 (93%), column: 0
            character: α (displayed as α) (codepoint 945, #o1661, #x3b1)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x03B1
               script: greek
               syntax: w 	which means: word
             category: .:Base, G:2-byte Greek, L:Left-to-right (strong), c:Chinese, g:Greek, h:Korean, j:Japanese
             to input: type "C-x 8 RET HEX-CODEPOINT" or "C-x 8 RET NAME"
          buffer code: #xCE #xB1
            file code: #xCE #xB1 (encoded by coding system utf-8-unix)
              display: composed to form "ά̓" (see below)

Composed with the following character(s) "́̓" using this font:
  nil:-apple-DejaVu_Sans-medium-normal-normal-*-12-*-*-*-p-0-iso10646-1
by these glyphs:
  [0 2 945 837 8 0 9 6 0 nil]
  [0 2 769 690 2 -6 5 2 0 [-4 0 0]]
  [0 2 787 708 2 -6 3 2 0 [-3 0 0]]

Character code properties: customize what to show
  name: GREEK SMALL LETTER ALPHA
  general-category: Ll (Letter, Lowercase)
  decomposition: (945) ('α')
--------------------------------------------------------------------------------------------------------------------------------------