* Separate gnome-shell 3.26 theme from 3.18
* Update gnome-shell overview window-caption colors
Since gnome-shell 3.26, the window-caption in application overview was
moved from below the window preview, to the bottom edge of the preview.
Subsequently, colors of the window-caption were also changed.
3ce23ca964
This commit reflects the change in Arc shell theme.
* Remove unused CSS property from shell captions
The -shell-caption-spacing property in .window-caption has not been
used since gnome 3.26.
d0f74b58c3