GtkScale: Add margin to the scale trough to recover the original style - SL #3983
GtkScale: Add margin to the scale trough to recover the original style - SL #3983

This is the same thing that current Adwaita theme does in
gnome-themes-standard to make the trough smaller than the slider.

The margin value is hardcoded to get it right in the XO sugar-100
theme, but should be calculated later, when we fix the sugar-72 theme.
It looks like we will need different SVG images for that theme too.

Signed-off-by: Manuel Quiñones <6f5069c5b6be23302a13accec56587944be09079@laptop.org>
Acked-by: Simon Schampijer <088e16a1019277b15d58faf0541e11910eb756f6@laptop.org>
Signed-off-by: Ajay Garg <1c58a446a63e719d7b90156a8998ccc461609ed7@activitycentral.com>

ceibal-tatu/sugar-artwork,ceibal-tatu/sugar-artwork,ceibal-tatu/sugar-artwork