>>>>> "Kenichi" == Kenichi Handa <handa@m17n.org> writes:

>> The combining sequences do not show up for me until I move the point
>> through them.  After that, the rest of that line is displayed a la the
>> cursor.  (Purple background and white foreground in my case.)

Kenichi> How is the sequence displayed before you move point to them?

The line in the file is:

UTF-8 encoded: Ө̄ ө̄<br>

Instead of showing that, all I see is:

UTF-8 encoded:  <br>

Kenichi> What is shown when you move point on the first cahracter of
Kenichi> that sequence (U+ 04E8) and type C-u C-x =?

When I move the point to that character, I see the Ө in white-on-purple
(my cursor is purple) followed by the combining macron in white-on-purple
with all of the rest of that line in purple.  When I switch focus to
another window the open purple box covers the a bit of space, the <br>,
the ^M and extends to the right margin.

C-u C-x = says:

        character: Ө (1256, #o2350, #x4e8)
preferred charset: unicode (Unicode (ISO10646))
       code point: 0x04E8
           syntax: w 	which means: word
         category: y:Cyrillic
      buffer code: #xD3 #xA8
        file code: #xD3 #xA8 (encoded by coding system utf-8-unix)
          display: composed to form "Ө̄" (see below)

Composed with the following character(s) "̄" using this font:
  xft:-unknown-DejaVu Sans Mono-normal-normal-normal-*-14-*-*-*-m-0-iso10646-1
by these glyphs:
  [0 1 1256 978 8 0 8 11 1 nil]
  [0 1 772 647 -9 2 6 10 -9 [0 0 -9]]

Character code properties: customize what to show
  name: CYRILLIC CAPITAL LETTER BARRED O
  general-category: Lu (Letter, Uppercase)

There are text properties here:
  fontified            t


In that output above (including in this buffer), I see:

        display: composed to form "" (see below)

Kenichi> I don't understand how this looks like: "the rest of that
Kenichi> line is displayed a la the cursor".  Please send me the
Kenichi> image?