Re: variable-pitch-mode misaligns org-mode heading tags

[Jeff Filipovits <jrfilipovits@gmail.com>]

Adam,

Thanks. You are right of course and I realized the right-align 
issue right after I sent my email. 

Adam Spiers <orgmode@adamspiers.org> writes:

> But the whole point of this exercise is to support 
> variable-width
> fonts.  In this case, the correct position for the end of the 
> single
> space is most likely not even a multiple of the fixed column 
> width, so
> it would probably need to be measured in pixels rather than
> columns. And in order to calculate it, it is first necessary to
> calculate the exact width in pixels of the colon-delimited list 
> of
> tags. As I mentioned in the comment linked above, I searched for 
> a way
> of calculating the pixel width of the tag list, and the best I 
> could
> find was `pos-visible-in-window-p' which has some issues which I
> mentioned there.  If you have thoughts on whether I'm right 
> about
> those, and if so how to solve them, I'd love to hear! Cheers,
> Adam

It looks like (window-text-pixel-size) could be used to calculate 
the pixel length of the tags list? I am having trouble deciphering 
the manual 
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Pixel-Specification.html#Pixel-Specification) 
for pixel specification for spaces, though. The right alignment 
specification for some reason sends the tags to the next line, as 
do most other solutions that I would expect to align the text to 
the right side of the window. 

I can experiment more in a couple days, but in the meantime maybe 
someone smarter than me give some hints on how to use the pixel 
specification properties. 

> BTW I tried your code and for some reason it didn't insert any 
> space
> for me, but I didn't look into that yet.

The way it’s written it would only reduce the gap between the 
headline and tags to a space, and it assumes there are multiple 
spaces there already. If there’s no space between the two, I don’t 
think it’ll insert one. Probably not the best way as it was thrown 
together to test the text property fix. 

I accepted long ago that the solution to using a variable pitch 
font for org headings was that the tags would not be aligned to 
the right and never looked back, so maybe this is not worth the 
price of fixing it if it is messy. And diving down to calculating 
the pixel width of text seems like it’s getting pretty messy. 

-- 
Jeff Filipovits
Spears & Filipovits, LLC
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