[gnome-builder] style: add treeview style tweaks

[Christian Hergert <chergert src gnome org>]

commit 915194b52b4206a0977d4864caed293cb8ecd9b3
Author: Christian Hergert <chergert redhat com>
Date:   Fri May 6 19:55:44 2016 +0300

    style: add treeview style tweaks

 data/theme/Adwaita-shared.css |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/Adwaita-shared.css b/data/theme/Adwaita-shared.css
index daccec6..d9ca478 100644
--- a/data/theme/Adwaita-shared.css
+++ b/data/theme/Adwaita-shared.css
@@ -125,3 +125,8 @@ entry.search-missing {
 entry.search-missing > image {
   color: white;
 }
+
+
+/* tweak icons for treeviews */
+treeview.image { color: alpha(currentColor, 0.8); }
+treeview.image:selected { color: alpha(@theme_selected_fg_color, 0.9); }