Unable to use Scilab with default Ambiance theme because of low contrast in the menu

[Norbert]

Steps to reproduce:
1. Install Ubuntu with all default settings (Ambiance theme)
2. Install Scilab
3. Launch Scilab
4. Try to use Scilab menu on the top of its window
5. This menu has low contrast (see screenshot from 14.04).

Temporary solution:
switch theme to light (Radiance) theme.

Affected Ubuntu versions:
12.04 LTS, 14.04 LTS, 16.04 LTS, 16.10, 17.04, 17.10, 18.04 LTS.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: scilab 5.5.0-2
ProcVersionSignature: Ubuntu 3.19.0-49.55~14.04.1-generic 3.19.8-ckt12
Uname: Linux 3.19.0-49-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CurrentDesktop: Unity
Date: Fri Feb 19 18:31:09 2016
InstallationDate: Installed on 2015-12-12 (68 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
PackageArchitecture: all
SourcePackage: scilab
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Ubuntu 17.10 final with all updates - bug is not fixed.

[Norbert (nrbrtx)]

Ubuntu MATE 17.10 is affected too. Scilab is unusable with default Ambiant-MATE theme.

[Norbert (nrbrtx)]

Bionic with all updates, bug exists.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Norbert (nrbrtx)]

18.04 LTS with all updates, bug exists.

[Daniel van Vugt (vanvugt)]

It looks like Scilab is hard-coding black (and white) fonts in a couple of places. That may be a problem confined to the Scilab source code.

[Daniel van Vugt (vanvugt)]

Norbert,

What does it look like with cosmic's Yaru theme?

[Norbert (nrbrtx)]

Tested Yaru theme on Cosmic - it does not change anything. Still have very low contrast.

[Daniel van Vugt (vanvugt)]

Thanks. That eliminates the possibility of the bug being in 'ubuntu-themes' since Yaru is outside of that. So this looks like a bug localised to Scilab.