[gnome-builder] style: add insensitive button styling for tab

[Christian Hergert <chergert src gnome org>]

commit 68e6f4a568216ffc1c3a4c5f4c5d0ed29ddbb4b4
Author: Christian Hergert <chergert redhat com>
Date:   Fri Dec 11 11:54:47 2015 -0800

    style: add insensitive button styling for tab

 data/theme/Adwaita-dark.css |    4 ++++
 data/theme/Adwaita.css      |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/Adwaita-dark.css b/data/theme/Adwaita-dark.css
index 1aaeeb1..0db32f9 100644
--- a/data/theme/Adwaita-dark.css
+++ b/data/theme/Adwaita-dark.css
@@ -114,6 +114,10 @@ layouttabbar button {
   padding: 9px;
 }
 
+layouttab button:insensitive {
+  opacity: 0.3;
+}
+
 layouttabbar > box > button:hover {
   color: #eeeeec;
 }
diff --git a/data/theme/Adwaita.css b/data/theme/Adwaita.css
index b99abd1..8853437 100644
--- a/data/theme/Adwaita.css
+++ b/data/theme/Adwaita.css
@@ -138,6 +138,10 @@ layouttab button {
   box-shadow: none;
 }
 
+layouttab button:insensitive {
+  opacity: 0.3;
+}
+
 layouttab label {
   color: #2e3436;
   font-size: 0.9em;