Merge lp:~elementary-apps/pantheon-photos/dark-theme-file-viewer into lp:~pantheon-photos/pantheon-photos/trunk

[Sergey "Shnatsel" Davidoff]

Use dark theme in the Direct mode, also known as Photo Viewer, that's invoked from file manager and all external applications.

Use dark theme in the Direct mode, also known as Photo Viewer, that's invoked from file manager and all external applications.
Does not affect the Library mode.

Before:
http://i.imgur.com/gkgaqph.png
http://i.imgur.com/PtWncTJ.png

After:
http://i.imgur.com/TzFAeKK.png
http://i.imgur.com/hWwxfWR.png

The headerbar is a little too bright, but that's a theme issue, not related to Shotwell's code. It's the same in Pantheon Files with forced dark theme: http://i.imgur.com/yGTh8XK.png

=== modified file 'src/Application.vala'
--- src/Application.vala	2014-09-06 00:21:04 +0000
+++ src/Application.vala	2014-12-18 00:09:36 +0000
@@ -60,6 +60,7 @@
             app_icon = "multimedia-photo-viewer";
             app_launcher = "shotwell-viewer.desktop";
             program_name = _("Photo Viewer");
+            Gtk.Settings.get_default().set("gtk-application-prefer-dark-theme", true);
             flags = GLib.ApplicationFlags.HANDLES_OPEN | GLib.ApplicationFlags.NON_UNIQUE;
         } else {
             // we've been invoked in library mode; set up for uniqueness and handling