* Overshoot code update. (#382)

gtk-3.20/scss/widgets/_overshoot.scss

@@ -22,6 +22,13 @@
     $_small_gradient_color: $color;
     $_big_gradient_color: $color;
 
+    @if $color == $fg_color {
+        $_small_gradient_color: darken($borders_color, 10%);
+        $_big_gradient_color: $fg_color;
+
+        @if $t == backdrop { $_small_gradient_color: $backdrop_borders_color; }
+    }
+
     $_small_gradient: -gtk-gradient(radial,
                                     $_position, 0,
                                     $_position, .5,
@@ -77,6 +84,13 @@
     background-repeat: $_gradient_repeat;
     background-origin: content-box;
     background-position: $_bg_pos;
+    border: 0;
+    box-shadow: none;
+}
+
+scrolledwindow {
+    viewport.frame { // avoid double borders when viewport inside scrolled window
+        border-style: none;
     }
 
     // This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
@@ -117,3 +131,19 @@ undershoot {
 
         &.right { @include undershoot(right); }
     }
+
+    junction { // the small square between two scrollbars
+        border-color: transparent;
+        // the border image is used to add the missing dot between the borders, details, details, details...
+        border-image: linear-gradient(to bottom, $borders_color 1px, transparent 1px) 0 0 0 1 / 0 1px stretch;
+        background-color: $scrollbar_bg_color;
+
+        &:dir(rtl) { border-image-slice: 0 1 0 0; }
+
+        &:backdrop {
+            border-image-source: linear-gradient(to bottom, $backdrop_borders_color 1px, transparent 1px);
+            background-color: $backdrop_scrollbar_bg_color;
+            transition: 200ms ease-out;
+        }
+    }
+}