[dconf-editor] Allow to override default widgets states.

[Arnaud B. <arnaudb src gnome org>]

commit 3116612276df2cda68ee0eeff922439f85db4ec9
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jan 14 14:36:48 2019 +0100

    Allow to override default widgets states.
    
    That way, an application using BaseWindow can display
    a window title in the headerbar center on large size.

 editor/base-headerbar.vala | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/editor/base-headerbar.vala b/editor/base-headerbar.vala
index e533218..98263f1 100644
--- a/editor/base-headerbar.vala
+++ b/editor/base-headerbar.vala
@@ -245,6 +245,11 @@ private class BaseHeaderBar : NightTimeAwareHeaderBar, AdaptativeWidget
         if (is_not_requested_mode (default_mode_id, requested_mode_id, ref _this.default_mode_on))
             return;
 
+        _this.set_default_widgets_default_states (_this);
+    }
+
+    protected virtual void set_default_widgets_default_states (BaseHeaderBar _this)
+    {
         _this.set_default_widgets_states (/* title_label text or null */ null,
                                           /* show go_back_button      */ false,
                                           /* show ltr_left_separator  */ false,