[gnome-music/wip/jfelder/devel-version: 9/9] app: Add a visual hint for the development version

[Jean Felder <jfelder src gnome org>]

commit 2a000ccf4352a5473d44afbaa0b28b94b085d4e7
Author: Jean Felder <jfelder src gnome org>
Date:   Wed Jun 27 22:04:02 2018 +0200

    app: Add a visual hint for the development version
    
    Add a specific style to Music when running in devel mode. It makes the
    development version easily recognizable.
    
    Closes: #185

 data/application.css      | 8 ++++++++
 gnomemusic/application.py | 2 ++
 2 files changed, 10 insertions(+)
---
diff --git a/data/application.css b/data/application.css
index 70837e8a..444ce66b 100644
--- a/data/application.css
+++ b/data/application.css
@@ -122,3 +122,11 @@ box#ArtistAlbumsWidget .artist-label {
 .playing-song-label {
     font-weight: bold;
 }
+
+/* visual hint for development */
+.devel headerbar {
+    background: @theme_bg_color linear-gradient(to top,
+                                               alpha(@theme_selected_bg_color, 0.34),
+                                               alpha(@theme_selected_bg_color, 0.27) 2px,
+                                               alpha(@theme_selected_bg_color, 0.20) 3px);
+}
diff --git a/gnomemusic/application.py b/gnomemusic/application.py
index 707ce1b4..2d4926b1 100644
--- a/gnomemusic/application.py
+++ b/gnomemusic/application.py
@@ -113,6 +113,8 @@ class Application(Gtk.Application):
         if not self._window:
             self._window = Window(self)
             self._window.set_default_icon_name(self._application_id)
+            if self._application_id == 'org.gnome.MusicDevel':
+                self._window.get_style_context().add_class('devel')
             MediaPlayer2Service(self)
 
         self._window.present()