[Bug 932958] [NEW] Missing characters in monospace fonts fall back to proportional fonts

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gnome-terminal 3.0.1-0ubuntu3, Ubuntu 11.10
gnome-terminal 3.6.2-0ubuntu1, Ubuntu 15.04

When a character is not present in whichever monospace font you are
using, Ubuntu chooses a proportional font to render it.

This is usually not desirable. In a terminal, for example, the
proportional character is often too wide and therefore overlapped by the
following character.

For example:
- bug 819708 (heavy line-drawing characters not lined up in Ubuntu Mono)
- bug 1116428 ('DOTTED CIRCLE' and 'BLACK CIRCLE' substituted from a wider font)
- bug 1094434 ("font lacks that symbols and use the ones from the other font which have incorrect sizes")
- bug 736613 ("the ! is rendered on top of the C")
- this bug as originally reported (U+25B7 white right-pointing triangle and U+20AF drachma overlapping with following characters).

This happens with multiple monospace fonts -- Droid Sans Mono, Terminus,
TlwgMono Medium, and Ubuntu Mono -- suggesting that it is a problem with
fontconfig, rather than with the individual fonts.

** Affects: fontconfig (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: fonts-tlwg (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: ttf-droid (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: ubuntu-font-family-sources (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: xfonts-terminus (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug apport-lpi oneiric running-unity
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Missing characters in monospace fonts fall back to proportional fonts
https://bugs.launchpad.net/bugs/932958
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