[gnome-boxes] shared-folder-popover: Select PUBLIC_SHARE by default

[Felipe Borges <felipeborges src gnome org>]

commit 96ae9cad86ba7f0399f097f2d87a47e67396d7ab
Author: Felipe Borges <felipeborges gnome org>
Date:   Thu Apr 5 14:58:17 2018 +0200

    shared-folder-popover: Select PUBLIC_SHARE by default
    
    The GtkFileChooserButton widget will show "None" if a path isn't
    selected. This is unintuitive for users that don't recognize the
    look and feel of the button.

 src/shared-folder-popover.vala | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/shared-folder-popover.vala b/src/shared-folder-popover.vala
index d257b1d9..f1e095b8 100644
--- a/src/shared-folder-popover.vala
+++ b/src/shared-folder-popover.vala
@@ -12,6 +12,11 @@
 
     public int target_position;
 
+    construct {
+        var default_path = Environment.get_user_special_dir (UserDirectory.PUBLIC_SHARE);
+        file_chooser_button.set_current_folder (default_path);
+    }
+
     [GtkCallback]
     public void on_cancel (Gtk.Button cancel_button) {
         popdown ();