[Bug 1570533] [NEW] wrong character width with Ubuntu Mono and replacement fonts in gnome-terminal:

Thu, 14 Apr 2016 14:00:02 -0700 

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I'm using Ubuntu Mono in gnome-terminal.  When displaying some unicode
(non ascii) characters that are not in Ubuntu Mono and a fallback font
is used, the spacing between the glyphs is wrong (too small).  The
fallback characters are double width, but the next character is display
after a single width, leading into overlapping characters.

If I see this correctly, gnome-terminal is using libvte which is using
pango to render text. I therefore checked how pango renders this with
`pango-view --font="Ubuntu Mono 32" --markup --text='<span
fallback="true">xxxxxxxxxxxxxxxxxxxxxxxxx&#13A▷C✚D⚑F↓G↑H..I☺J</span>'`
and `pango-view --font="Ubuntu Mono 32" --markup --text='<span
fallback="true">xxxxxxxxxxxxxxxxxxxxxxxxx&#13A▷C✚D⚑F↓G↑H..I☺J</span>'` .
In both cases double with characters or "replacement boxes" are
displayed and no overlapping occurs.

If I use the "monospace" font, no overlapping occurs in gnome-terminal.

Whose fault is this and how can it be fixed?


I'm on Ubuntu 14.04.4 LTS, gnome-terminal's version is 3.6.2-0ubuntu1, 
tf-ubuntu-font-family 0.80-0ubuntu6 and everything is up to date.

** Affects: gnome-terminal (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
wrong character width with Ubuntu Mono and replacement fonts in gnome-terminal:
https://bugs.launchpad.net/bugs/1570533
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