[Bug 1872370] [NEW] gedit current line is illegibly highlighted on Breeze-Dark theme

[Daniel Tang]

Public bug reported:

When gedit is launched in KDE with the Breeze-Dark theme active, the
line with the cursor is highlighted white even though the text is white.
This makes it impossible to read the text.

"lsb_release -rd":

Description:    Ubuntu Focal Fossa (development branch)
Release:        20.04

"apt-cache policy gedit"

gedit:
  Installed: 3.36.1-1
  Candidate: 3.36.1-1
  Version table:
 *** 3.36.1-1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

"apt-cache policy kde-config-gtk-style"

kde-config-gtk-style:
  Installed: 4:5.18.4.1-0ubuntu1
  Candidate: 4:5.18.4.1-0ubuntu1
  Version table:
 *** 4:5.18.4.1-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

"apt-cache policy breeze-gtk-theme"

breeze-gtk-theme:
  Installed: 5.18.4.1-0ubuntu1
  Candidate: 5.18.4.1-0ubuntu1
  Version table:
 *** 5.18.4.1-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

Procedure:

1. Spin up a VirtualBox VM
2. Insert http://cdimage.ubuntu.com/kubuntu/daily-live/20200412/focal-desktop-amd64.iso as the CD
3. Click on "Try Kubuntu"
4. Open Konsole
5. Run "sudo apt install gedit"
6. Open System Settings
7. Go into "Global Theme"
8. Select "Breeze Dark"
9. Click "Apply"
10. Click the home icon
11. Go into "Application Style"
12. Click "Configure GNOME/GTK Application Style"
13. Set both the "GTK2 theme" and "GTK3 theme" dropdowns to "Breeze-Dark"
14. Click "Apply"
15. Open gedit
16. Type some text

Expected behavior:

To be able to read the line I'm typing on.

This was the behavior before Ubuntu 20.04 unified GTK and Qt themes.
While restoring the behavior would be better than having completely
illegible text, it would be preferred to get gedit and the Breeze-Dark
theme to actually work together.

Actual behavior:

The current line is illegible. The line is highlighted white even though
the text is white.

A screenshot of this behavior is attached.

Workaround:

Move the cursor to another line before trying to read the text, or
select the text before trying to read it. This workaround is very
annoying.

** Affects: breeze (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gedit (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: kde-gtk-config (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot_20200412_175310.png"
   https://bugs.launchpad.net/bugs/1872370/+attachment/5352860/+files/Screenshot_20200412_175310.png

** Also affects: kde-gtk-config (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: breeze (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1872370

Title:
  gedit current line is illegibly highlighted on Breeze-Dark theme

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