[gtk+] Adwaita: tweak treeview dnd drop target

[Lapo Calamandrei <lapo src gnome org>]

commit cf0aba14e7b19baf394213057251e80c1cfaf647
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Thu Dec 11 15:35:38 2014 +0100

    Adwaita: tweak treeview dnd drop target

 gtk/theme/Adwaita/_common.scss           |    4 +++-
 gtk/theme/Adwaita/gtk-contained-dark.css |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index b0b525d..0751280 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1400,7 +1400,9 @@ GtkTreeView.view {
   }
 
   &.dnd {
-    border: 1px solid;
+    border-style: solid none;
+    border-width: 1px;
+    border-color: mix($fg_color, $selected_bg_color, 50%);
   }
 
   &.expander {
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index c9d7371..1bbf73e 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -2047,7 +2047,9 @@ GtkTreeView.view {
     border-left-color: #666a6a;
     border-top: #393f3f; }
   GtkTreeView.view.dnd {
-    border: 1px solid; }
+    border-style: solid none;
+    border-width: 1px;
+    border-color: #87a5c4; }
   GtkTreeView.view.expander {
     -gtk-icon-source: -gtk-icontheme("pan-end-symbolic");
     color: #b2b2b1; }