[Bug 1398676] New: Pango sometimes shows a replacement character for space (U+0020) when a font lacks a space

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1398676

            Bug ID: 1398676
           Summary: Pango sometimes shows a replacement character for
                    space (U+0020) when a font lacks a space
           Product: Fedora
           Version: 25
         Component: pango
          Assignee: tagoh(a)redhat.com
          Reporter: mfabian(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: fonts-bugs(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org, tagoh(a)redhat.com



Created attachment 1224372
  --> https://bugzilla.redhat.com/attachment.cgi?id=1224372&action=edit
pango-bug.png

Tested on the released version of Fedora 25.
pango-1.40.3-1.fc25.x86_64

When using a font which does not have a space, Pango may show a replacement
character for space( U+0020).

I’ll attach the file rovas.txt which has a first line containing only Old
Hungarian
script and a space.

I’ll also attach an old Hungarian font taken from
https://github.com/OldHungarian/old-hungarian-font/releases which lacks a
space.

Display the test file like this:

    pango-view --font="Old Hungarian" ~/rovas.txt


And you get something as in the also attached screenshot which shows
that Pango renders the space as an replacement character.

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