GTK+-3.20 GreenLaguna: use the LSD effect on popover arrows too + other adjustments
GTK+-3.20 GreenLaguna: use the LSD effect on popover arrows too + other adjustments

- fix jumping label in list rows
- try eliminate any text-shadows in menus
- sync popover hover background-image with other menus
- fix button.link jumping in mate-appearance-properties

mate-desktop/mate-themes