bug#15138: Font selection error on OSX

[Jan Djärv]

Hi.

27 aug 2013 kl. 21:08 skrev Michael Toomim <toomim@cs.washington.edu>:

> That sounds very strange indeed!  Thank you very much for investigating this. 
>  Where in the source are you looking?
> 

Just tracing calls and parameters to functions in nsfont_driver in nsfont.m.

        Jan D.

> On Aug 27, 2013, at 8:59 AM, Jan Djärv <jan.h.d@swipnet.se> wrote:
> 
>> Hello. 
>> 
>> This seems to be in the general font code. It does not even try to check if 
>> that glyph is present in the current font (it is), but instead asks for a 
>> font with script symbol. The logic seems strange to me. 
>> 
>>    Jan D. 
>> 
>> 26 aug 2013 kl. 18:14 skrev Jan Djärv <jan.h.d@swipnet.se>:
>> 
>>> Hello.
>>> 
>>> 20 aug 2013 kl. 04:44 skrev Michael Toomim <toomim@cs.washington.edu>:
>>> 
>>>> A simple way to reproduce this bug is to press option-8 (inserts a bullet 
>>>> on a mac) anywhere in a text buffer. You can see the line grow taller.
>>>> 
>>>> In default OSX settings, you'll need to (setq ns-alternate-modifier 'none) 
>>>> before you can use option-8.
>>> 
>>> It is strictly not a font rendering error, but a font selection error.  The 
>>> bullet is from a different font than the surrounding text.
>>> 
>>>  Jan D.
>>> 
>>>> On Aug 19, 2013, at 7:37 PM, Michael Toomim <toomim@gmail.com> wrote:
>>>> 
>>>>> Some extended characters are rendered incorrectly in the new Cocoa 24.3 
>>>>> emacs on OSX. They are rendered:
>>>>> - too small
>>>>> - too tall (forcing an increase in line-height of a pixel or two)
>>>>> 
>>>>> The result is that some lines are too tall, and monospace layouts (like 
>>>>> ASCII art) lose alignment.
>>>>> 
>>>>> Here is an example in three screenshots, where the "•" bullet character 
>>>>> is rendered incorrectly. The first screenshot shows the bug on the 
>>>>> current release. You can see that the center line takes up too much 
>>>>> vertical space, and not enough horizontal space. This is a monospace font 
>>>>> (apple monaco).
>>>>> 
>>>>> The second and third show the correct rendering. The second is an older 
>>>>> emacs build I have that rendered text with Carbon. The third is Apple's 
>>>>> native TextEdit.app, for reference.
>>>>> 
>>>>> 
>>>>> <PastedGraphic-21.png>
>>>>> <PastedGraphic-19.png>
>>>>> <PastedGraphic-20.png>
>>>