[geary] Use FileChooserNative for save/save all as well. Bug 770467

[Michael Gratton <mjog src gnome org>]

commit acb6b705fffd4f3deb3dde19d9efde98317ef719
Author: Gautier Pelloux-Prayer <gautier+git damsy net>
Date:   Wed Oct 5 10:24:21 2016 +0200

    Use FileChooserNative for save/save all as well. Bug 770467

 src/client/application/geary-controller.vala |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/client/application/geary-controller.vala b/src/client/application/geary-controller.vala
index 0ce60ce..bb79db5 100644
--- a/src/client/application/geary-controller.vala
+++ b/src/client/application/geary-controller.vala
@@ -1932,8 +1932,13 @@ public class GearyController : Geary.BaseObject {
         Gtk.FileChooserAction action = (attachments.size == 1)
             ? Gtk.FileChooserAction.SAVE
             : Gtk.FileChooserAction.SELECT_FOLDER;
+#if GTK_3_20
+        Gtk.FileChooserNative dialog = new Gtk.FileChooserNative(null, main_window, action,
+            Stock._CANCEL, Stock._SAVE);
+#else
         Gtk.FileChooserDialog dialog = new Gtk.FileChooserDialog(null, main_window, action,
-            Stock._CANCEL, Gtk.ResponseType.CANCEL, Stock._SAVE, Gtk.ResponseType.ACCEPT, null);
+             Stock._CANCEL, Gtk.ResponseType.CANCEL, Stock._SAVE, Gtk.ResponseType.ACCEPT, null);
+#endif
         if (last_save_directory != null)
             dialog.set_current_folder(last_save_directory.get_path());
         if (attachments.size == 1) {
@@ -1986,8 +1991,13 @@ public class GearyController : Geary.BaseObject {
     }
     
     private void on_save_buffer_to_file(string? filename, Geary.Memory.Buffer buffer) {
+#if GTK_3_20
+        Gtk.FileChooserNative dialog = new Gtk.FileChooserNative(null, main_window, 
Gtk.FileChooserAction.SAVE,
+            Stock._CANCEL, Stock._SAVE);
+#else
         Gtk.FileChooserDialog dialog = new Gtk.FileChooserDialog(null, main_window, 
Gtk.FileChooserAction.SAVE,
             Stock._CANCEL, Gtk.ResponseType.CANCEL, Stock._SAVE, Gtk.ResponseType.ACCEPT, null);
+#endif
         if (last_save_directory != null)
             dialog.set_current_folder(last_save_directory.get_path());
         if (!Geary.String.is_empty(filename))