From: Keith David Bershatsky <esq@lawlist.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Problems with move_it_in_display_line_to X when tabs exist.
Date: Sat, 02 Dec 2017 14:28:31 -0800 [thread overview]
Message-ID: <m21skcu5m8.wl%esq@lawlist.com> (raw)
Here are the four values. It looks like it.current_x is where I expected it to be, but it.what is showing a character instead of a stretch.
(gdb) print it.what
$1 = IT_CHARACTER
(gdb) print it.char_to_display
$2 = 9
(gdb) print it.method
$3 = GET_FROM_DISPLAY_VECTOR
(gdb) print it.current_x
$4 = 44
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
DATE: [12-02-2017 13:14:33] <02 Dec 2017 23:14:33 +0200>
FROM: Eli Zaretskii <eliz@gnu.org>
>
> > Date: Sat, 02 Dec 2017 11:52:33 -0800
> > From: Keith David Bershatsky <esq@lawlist.com>
> > Cc: emacs-devel@gnu.org
> >
> > The test assumes:
> >
> > * The variable word-wrap is non-nil.
> >
> > * The variable tab-width is 2.
> >
> > * The buffer-display table entry for a tab is: [(187 . 120) (9 . 121)].
> >
> > * Native line numbers are _not_ enabled.
> >
> > I have a long line that wraps at the window edge and I put a space to simulate a new word that should be wrapped to the following line. To make it easier to read, I am using the backslash symbol (below) to signify a word-wrap with a space at the window edge. The next line has three "x" followed by a tab and then the word "hello-world". The STRETCH glyph is 22 pixels wide; however, it.pixel_width is erroneously (?) reporting that it is 11 pixels wide.
> >
> > I have hard-coded an emacs_abort () when it.c == '\t', which means that we have just moved passed character 187 (aka "»") and we are now on a STRETCH tab-width.
>
> What is the value of it.what and of it.char_to_display? And what is
> the value of it.method and it.current_x?
>
> My crystal ball says that, since your display table shows a TAB as 2
> characters, the first of which is a u+00bb, and is displayed as an
> 11-pixel glyph, that is the display element whose metrics you are
> seeing. The stretch glyph produced by the TAB from the display table
> is after that.
next reply other threads:[~2017-12-02 22:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-02 22:28 Keith David Bershatsky [this message]
2017-12-03 3:32 ` Problems with move_it_in_display_line_to X when tabs exist Eli Zaretskii
-- strict thread matches above, loose matches on Subject: below --
2018-01-23 7:38 Keith David Bershatsky
2018-01-21 20:32 Keith David Bershatsky
2018-01-16 17:53 Keith David Bershatsky
2018-01-16 4:41 Keith David Bershatsky
2018-01-16 17:00 ` Eli Zaretskii
2018-01-15 5:48 Keith David Bershatsky
2018-01-15 12:06 ` Eli Zaretskii
2017-12-06 16:24 Keith David Bershatsky
2017-12-04 8:03 Keith David Bershatsky
2017-12-04 3:01 Keith David Bershatsky
2017-12-04 16:26 ` Eli Zaretskii
2017-12-03 20:56 Keith David Bershatsky
2017-12-04 15:48 ` Eli Zaretskii
2017-12-03 3:38 Keith David Bershatsky
2017-12-03 14:29 ` Eli Zaretskii
2017-12-02 19:52 Keith David Bershatsky
2017-12-02 21:14 ` Eli Zaretskii
2017-11-30 4:29 Keith David Bershatsky
2017-11-29 6:12 Keith David Bershatsky
2017-11-29 18:04 ` Eli Zaretskii
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