I added another screenshot that shows how to easily reproduce this issue
using pango-view utility.
It also shows the difference in rendering between 16.04 and 18.04.
** Attachment added: "Screenshot demonstrating how to reproduce the issue with
pango-view"
https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/1783452/+attachment/5206604/+files/pango-view-example.png
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https://bugs.launchpad.net/bugs/1783452
Title:
Some font glyphs are rendered incorrectly (with additional vertical
spacing) in GTK applications
Status in gtk+2.0 package in Ubuntu:
New
Bug description:
After switching from 16.04 to 18.04 I noticed that fonts are now (in
18.04) rendered differently in GTK+ apps.
For example, there is a vertical bar charcter `│`
[U+2502](https://unicode-table.com/en/2502), that is used extensively to create
solid vertical lines using just text characters.
You can see it in console apps such as `mc` or `pstree`.
While it is rendered correctly in Terminal in both 16.04 and 18.04, when
rendered inside GTK apps it has unexpected vertical gap in-between characters
on 18.04 (16.04 renders it correctly).
The issue can be seen in GTK apps such as gVIM, Geany, GEdit, but Qt apps
seem to render it properly.
I have attached a screenshot that clearly demonstrates the difference.
It shows brand new Ubuntu 16.04 on a left side where you can see
vertical line in GEdit is completely solid, as it should be. On a
right side it shows Ubuntu 18.04 where you can see line now has gaps
that should not be there.
I built a small GTK2 test app that reproduces the problem (sources at
https://pastebin.com/WCH1ds4P), and using it I found that the problem
occurs when libfreetype 2.8+ is used. I tested FreeType 2.6, 2.7,
2.7.1 and all of them work fine. While 2.8 and above has this gap.
I am not 100% sure if this is an Ubuntu font configuration issue, or
bug in FreeType, or GTK or some other Ubuntu components, but I hope
someone at least can point me at the right direction.
Please also check my post on AskUbuntu which has additional detail and
screenshots: https://askubuntu.com/questions/1054779/incorrect-font-
glyphs-rendering-in-gtk-applications-in-ubuntu-18-04
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