Re: [PATCH] org: Fix tag width calculation for multi-column chars

[Rasmus <rasmus@gmx.us>]

Samuel Wales <samologist@gmail.com> writes:

> i wonder if this also fixes tags for variable pitch (proportional)
> fonts.  i have been having great success with variable pitch fonts and
> it would be great if this fixes tags for them too.

No.

    https://www.gnu.org/software/emacs/manual/html_node/elisp/Size-of-Displayed-Text.html


You'd need pixel alignment.

Here’s a version that aligns the left part pf tags.

    (defun org-align-tags-here (&optional arg)
      ;; Assumes that this is a headline
      "Align tags on the current headline to TO-COL."
      (save-excursion
        (when (org-at-heading-p)
          (beginning-of-line)
          (re-search-forward org-complex-heading-regexp (line-end-position) t)
          (when (match-end 5) ; There’s a tag.
            (goto-char (match-end 4))
            (delete-region (point) (match-beginning 5))
            (insert (propertize
                     (make-string (- (abs org-tags-column) (current-column)
                                     (- (match-end 5) (match-beginning 5)))
                                  ?\s)
                     ;; one would need somehow intelligently figure out
                     ;; the maximum pixel number.
                     'display '(space :align-to (600))))))))


Questions if we were to pixel align:

- Can we drop right alignment of tags? (i.e. org-tags-column < 0).
- We might need to know the pixel width of :tags: anyway to set the width
  of the white space to "right-margin" - "width-of-tags".  Is this robust
  to resizing?  Or is there a "\hfill"-like property for Emacs space?
- How to determine max width on "auto-filled" file?  Go through each line
  or just make it a custom value?

Perhaps a nice "conservative" way is to introduce a org-tags-column-pixel,
but if we can find a good "automatic" way that’s nicer IMO.

Rasmus

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