Current line background color doesn't respect system dark theme

[Yuri Gor]

On Ubuntu 20.04 with a dark theme in gedit current line background color is bright white,
while the rest of the background is dark grey.
White font color on white background is 100% unreadable.

gedit:
  Installed: 3.36.2-0ubuntu1
  Candidate: 3.36.2-0ubuntu1
  Version table:
 *** 3.36.2-0ubuntu1 500
        500 http://at.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.36.1-1 500
        500 http://at.archive.ubuntu.com/ubuntu focal/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gedit 3.36.2-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 21 08:51:28 2020
InstallationDate: Installed on 2020-04-24 (27 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: gedit
UpgradeStatus: No upgrade log present (probably fresh install)

[Paul White (paulw2u)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1857191, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report.

Feel free to continue to report any other bugs you may find.