trisquel-gtk-theme: Pluma: org.mate.pluma color-scheme is unset

Upstream issue: https://github.com/shimmerproject/Greybird/issues/355

• See also: https://github.com/mate-desktop/mate-themes/issues/320

1. Affected Package revision / version

$ apt show trisquel-gtk-theme
Package: trisquel-gtk-theme
Version: 11.1

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2. Steps to Reproduce

When switching between themes from the trisquel-gtk-theme and ubuntu-mate-themes packages, the background color in Pluma does not revert to its original state after switching back to the initial theme. Another text editor, gedit, is not affected.

1. Open Pluma. It has a dark gray background:

2. run

$ gsettings get org.mate.pluma color-scheme
'oblivion'

3. sudo apt-get install ubuntu-mate-themes
4. Change the theme to Yaru-MATE-light:

$ gsettings get org.mate.pluma color-scheme
'Yaru'

4. Change back the theme to Trisquel:

The background color is still light in Pluma, verified by:

$ gsettings get org.mate.pluma color-scheme
'Yaru'

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3. Current Behavior

• Themes from the ubuntu-mate-themes package configure Pluma’s color scheme by running gsettings set org.mate.pluma color-scheme '[STYLE]', where [STYLE] should be replaced with the name of any color scheme file (without the file extension) found in /usr/share/gtksourceview-2.0/styles/ for GTK-2 themes, /usr/share/gtksourceview-3.0/styles/ for GTK-3 themes, and so on. For example: gsettings set org.mate.pluma color-scheme 'oblivion'.
• The themes from the trisquel-gtk-theme package does not behave like this.

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4. Expected Behavior (optional)

• The themes from the trisquel-gtk-theme package should behave like the Current Behavior for ubuntu-mate-themes

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5. Workaround (optional)

$ gsettings set org.mate.pluma color-scheme 'oblivion'

The color-scheme 'oblivion' is used by YaruOK, and YaruGreen, that are shipped with Trisquel.

Note: GTK-color scheme should not be changed. The theme will set it to: gsettings set org.mate.interface gtk-color-scheme 'bg_color_dark:#000 text_color_dark:#FFF'

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6. Suggestions, Investigation and Possible Causes (optional)

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7. Other Tests (optional)

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