[gnome-builder] project-tree: tweak CSS style

[Christian Hergert <chergert src gnome org>]

commit 6c08be52ef9814954f7866c5547324830c545da0
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jul 5 15:25:05 2017 -0700

    project-tree: tweak CSS style
    
    Fixes some selection issues and missing changes during
    selection. Also tries to be nice with backdrop.

 plugins/project-tree/themes/shared.css |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/plugins/project-tree/themes/shared.css b/plugins/project-tree/themes/shared.css
index e0b89f5..3244f26 100644
--- a/plugins/project-tree/themes/shared.css
+++ b/plugins/project-tree/themes/shared.css
@@ -1,12 +1,20 @@
-ideeditorsidebar treeview.project-tree:not(:selected) {
+ideeditorsidebar treeview.project-tree {
   -GtkTreeView-expander-size: 0;
   -GtkTreeView-horizontal-separator: 0;
   -GtkTreeView-vertical-separator: 6;
   -gtk-icon-source: none;
-  background: transparent;
-  color: @theme_fg_color;
   padding-left: 6px;
+  color: @theme_fg_color;
 }
-ideeditorsidebar treeview.project-tree:not(:selected):backdrop {
+ideeditorsidebar treeview.project-tree:not(:selected) {
+  background: transparent;
+}
+ideeditorsidebar treeview.project-tree:selected {
+  color: @theme_selected_fg_color;
+}
+ideeditorsidebar treeview.project-tree:backdrop {
   color: @theme_unfocused_fg_color;
 }
+ideeditorsidebar treeview.project-tree:selected:backdrop {
+  color: @theme_unfocused_selected_fg_color;
+}