[gnome-music] window: Fix PlaylistsView selection button state

[Marinus Schraal <mschraal src gnome org>]

commit c5181ec14ff600e50968e09e198a30cdc6986194
Author: Chinmay Gurjar <chnmgurjar gmail com>
Date:   Sat Feb 15 12:45:10 2020 +0000

    window: Fix PlaylistsView selection button state
    
    The selection button state for SearchHeaderBar while PlaylistsView or
    EmptyView is active was not set to inactive.
    
    Closes: #366

 gnomemusic/window.py | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gnomemusic/window.py b/gnomemusic/window.py
index cfc62af9..b41f3f53 100644
--- a/gnomemusic/window.py
+++ b/gnomemusic/window.py
@@ -426,6 +426,7 @@ class Window(Gtk.ApplicationWindow):
         ]
         allowed = self._current_view not in no_selection_mode
         self._headerbar.props.selection_mode_allowed = allowed
+        self._search_headerbar.props.selection_mode_allowed = allowed
 
     def _toggle_view(self, view_enum):
         # TODO: The SEARCH state actually refers to the child state of