Bug#882028: gedit: utf-8 combinator chars displayed at wrong position

[jnqnfe at gmail.com]

Package: gedit
Version: 3.22.1-1+b1

Utf-8 combinator characters are displayed at the wrong position,
merging with the next character rather than the previous. This happens
in the main edit box only; the file browser, title and tabs all display
such characters correctly.

Screenshot examples attached.

The characters used in the screenshots are the following sequence:

"ëéy̆"

This is (enclosed in quotes): U+00EB (e+diaeresis) U+0065 (e) U+0301
(accute accent combinator) U+0079 (y) U+0306 (breve combinator).

You can see that the e+diaeresis single char (U+00EB) obviously
displays fine, but he combinator chars are not.

The screenshot from libreoffice gives another example of what this
should look like.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gedit_v3.22.1.png
Type: image/png
Size: 4903 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/pkg-gnome-maintainers/attachments/20171117/57f1b21c/attachment-0003.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gedit_other_v3.22.1.png
Type: image/png
Size: 19684 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/pkg-gnome-maintainers/attachments/20171117/57f1b21c/attachment-0004.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: libreoffice_v5.4.3-rc1-2.png
Type: image/png
Size: 3141 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/pkg-gnome-maintainers/attachments/20171117/57f1b21c/attachment-0005.png>