48152 - Extra space around ’ (right single quote AKA apostrophe))

Status: RESOLVED INVALID

(Core :: Layout, defect, P3)

Description

[Peter Onyisi]

When an apostrophe is encoded as ’ weird extra space gets left around it,
as if the character's bounding box is wrong. Reproduces with Adobe Times, New
Century Schoolbook, and Utopia, and Bitstream Charter.

Comment 1

[Asa Dotzler [:asa]]

over to layout.  

Comment 2

[R.K.Aa.]

related to bug 48234 where ’ on Win NT makes space vanish instead

Comment 3

[Sean Richardson]

The character code ’ corresponds to "right single quote" in MS-Windows
cp-1252 fonts, but according to ISO-8859-1 the whole range from 128-159
is reserved for control codes, and according to Unicode and HTML 4.0, 
the proper references for "right single quote"  are ’, ’, 
and ’ (see http://www.hut.fi/u/jkorpela/www/windows-chars.html for
details). All of which suggests that ’ is being transcoded; the extra
space must be creeping in during the process.

It would be instructive to view a testcase for bug 48234, 
http://bugzilla.mozilla.org/showattachment.cgi?attach_id=12751
on Linux, to see if the same problem happens if ’ is used instead.

Comment 4

[Sean Richardson]

A snippet from the Mozilla M4 release notes, 
http://www.mozilla.org/projects/seamonkey/release-notes/m4.html --
>  Linux GFX uses multiple font to render Unicode text. Currently it takes 
>  Latin-1 and Japanese (0208) fonts only. Known problems: 
>
>  * Japanese fonts are large compared with Latin, causing overlap with lines 
>    above. You can use an environment variable to alleviate this problem: 
>      setenv GECKO_FONT_SIZE_FACTOR 1.5 
>
>  * Windows CP 1252 characters such as smart quotes are taken from Japanese 
>    font, which is often too large compared to Latin font. 

This raises the question, is it truly "extra space", or just the normal space
for the font the ’ glyph is pulled from, if it isn't available in the
font the other characters come from. 

[e-mail], it would likely help if you made a screenshot .gif or .png
file and attached it to this bug (use the _Create a new attachment_ link just
under the Keywords line, above).

Comment 5

[Nisheeth Ranjan]

Re-assigning 6 bugs from Clayton's list to Harish for further triage.

Comment 6

[harishd]

Triaging clayton's list:
-----------------------

Sounds like a pure layout problem. Mark I'm going to start with you. Please 
point this bug to right person if you're not the owner. Thanx
CCing waterson.

Comment 7

[Chris Waterson]

Maybe related to 47154, for which I have a fix. Stealing from attinasi.

Comment 8

[Marc Attinasi]

Attachment: Testcase comparing the spacing of ’ and a simple apostrophe...

Comment 9

[Peter Onyisi]

Attachment: Screenshot showing extra space after right single quote

Comment 10

[Chris Waterson]

Marking INVALID. I'm seeing the correct amount of space being drawn on Linux and
WinNT. Maybe this was fixed; don't know. We're laying this page out just like
4.x does.