Re: Font selection weirdness

[Juanma Barranquero]

On Thu, May 29, 2008 at 5:19 PM, Juanma Barranquero <address@hidden> wrote:

> In fact, removing all Type 1 fonts fixes all three problems I was
> having with font selection:
>
>  - The incorrect display of space for some missing characters (i.e.,
> the problem in this thread)

Well, removing the Type 1 fonts and compiling with your fixes has in
fact been a great help, but I still see some weirdness.

- I start Emacs using my preferred font, DejaVu Sans Mono-10.

- I display HELLO: the U+2200 char is shown correctly.

- I cut&paste it to *scratch*. Still correct. describe-char says:

        character: ∀ (8704, #o21000, #x2200)
preferred charset: unicode (Unicode (ISO10646))
       code point: 0x2200
           syntax: .    which means: punctuation
         category: h:Korean j:Japanese
      buffer code: #xE2 #x88 #x80
        file code: not encodable by coding system iso-latin-1-dos
          display: by this font (glyph code)
     -outline-DejaVu
Sans-normal-normal-normal-sans-13-*-*-*-p-*-ms-symbol (#xC28)

There are text properties here:
  auto-composed        t
  charset              japanese-jisx0208
  fontified            t
  rear-nonsticky       t

- I insert another U+2200, with ucs-insert. Shown as space (*not* as
an empty box). describe-char for this U+2200 says:

        character: ∀ (8704, #o21000, #x2200)
preferred charset: unicode (Unicode (ISO10646))
       code point: 0x2200
           syntax: .    which means: punctuation
         category: h:Korean j:Japanese
      buffer code: #xE2 #x88 #x80
        file code: not encodable by coding system iso-latin-1-dos
          display: by this font (glyph code)
     -outline-DejaVu Sans
Mono-normal-normal-normal-mono-13-*-*-*-c-*-iso10646-1 (#x03)

There are text properties here:
  auto-composed        t
  fontified            t

The obvious differences are the charset text property, and that the
correct FOR ALL is found in DejaVu Sans (ms-symbol), while the
"spaced" one comes from DejaVu Sans Mono (iso10646-1). Interestingly
enough, clear_cached_metrics is not being called.

Now, if I repeat the test with the default fontset (Emacs starts with
Courier New), the following differences happen:

 - clear_cached_metrics is triggered when displaying HELLO, though it
is for another character (U+0AA0) AFAICS.

 - The cut&pasted FOR ALL is still correct, and describe-char output
is like above.

 - The FOR ALL inserted with ucs-insert is shown as an empty box
(*not* space). Its describe-char output is this:

        character: ∀ (8704, #o21000, #x2200)
preferred charset: unicode (Unicode (ISO10646))
       code point: 0x2200
           syntax: .    which means: punctuation
         category: h:Korean j:Japanese
      buffer code: #xE2 #x88 #x80
        file code: not encodable by coding system iso-latin-1-dos
          display: by this font (glyph code)
     -outline-Courier
New-normal-normal-normal-mono-13-*-*-*-c-*-iso10646-1 (#x2200)

There are text properties here:
  auto-composed        t
  fontified            t

Hope this helps,

 Juanma