gedit tango color scheme display ugly white grid pattern

[Joseph Maillardet]

- launch gedit
- in the three lines "burger" menu, select "Preferences"
- in "View" tab, activate "Display grid pattern" option
- in "Font & Colors" tab, select "/* Tango */"

From now on, a uggly white grid covers the surface of the editing area.
Shouldn't this dark theme display a dark grid as well ?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gedit 3.35.90-1
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu18
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 2 11:09:04 2020
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: gedit
UpgradeStatus: Upgraded to focal on 2018-11-14 (473 days ago)