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bug#25621: 25.1; IPA chars problematic in orgmode table

From: Stephen Berman
Subject: bug#25621: 25.1; IPA chars problematic in orgmode table
Date: Mon, 06 Feb 2017 13:54:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

On Sun, 5 Feb 2017 23:57:07 +0000 bruce robertson <address@hidden> wrote:

> If you take the first "table" of char sequences and IPA glyphs in the
> *Help* buffer from C-h I i p a RET and run it through a pipeline,
> "perl -p -e 's/ +/_/g;s/\|/\\vert{}/g;s/_/ \| /g;s/^/\| /;s/$/ \ |/'"
> , you'll have the right data.
> Then if you put that into an org-mode buffer and cause the "special
> symbols" like \vert to be displayed, type C-c C-x \.
> Now if you position to the 1st cell in the table and start typing TAB
> as the cursor moves through the table, I believe you will see strange
> results.

I can reproduce the "strange results", i.e. bad column alignment in the
table, in current master with -Q but not with my initializations.  The
crucial difference is the font used: with -Q it is this:

"-unknown-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1"

and with my initializations it's this:

"-unknown-DejaVu Sans Mono-normal-normal-normal-*-12-*-*-*-m-0-iso10646-1"

If I start with -Q, do `M-x set-frame-font' and enter the latter font,
and then carry out the above recipe, the table columns are all correctly

I noticed that the alignment was already not completely correct before
executing `C-c C-x \': some characters have a narrower width, e.g. the
character #x2c8 (MODIFIER LETTER VERTICAL LINE) in the second column of
the second row.  With my initializations this character is displayed in
the same font as the default font listed above, but with -Q it is
displayed in a different font from the default font:

"-unknown-DejaVu Serif-normal-italic-normal-*-15-*-*-*-m-0-iso10646-1"

Steve Berman

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