Wierd switch slider border on selected list row
Right border is half grey, half blue (screenshot taken from dconf-editor). It happens, because old slider was square with grey right border.
Possible solutions:
I prefer the first one (left image), but it will require something like this (see code below, could be improved somehow), while the second one (right image) is much simpler (just remove these lines). Moreover, gnome-control-center already has the same sliders-on-selected-row (as in second variant) in some tabs (search, for example).
slider:dir(ltr) {
$_border_bg_switch: linear-gradient(to right, $selected_borders_color 50%, $alt_borders_color 50%);
$_border_bg_switch_top: linear-gradient(to bottom, $selected_borders_color 1px, transparent 1px);
$_border_bg_switch_bottom: linear-gradient(to top, $selected_borders_color 1px, transparent 1px);
background-image: $button_fill, $_border_bg_switch_top, $_border_bg_switch_bottom, $_border_bg_switch;
border-color: transparent;
background-origin: padding-box, border-box, border-box, border-box;
background-clip: padding-box, border-box, border-box, border-box;
}