[gtk] color picker: Better debug spew

[Matthias Clasen <matthiasc src gnome org>]

commit 47928b9e14e070e2a344ebe3892b2538d3caf98b
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jul 30 17:59:16 2018 -0400

    color picker: Better debug spew
    
    This will help in debugging issues.

 gtk/gtkcolorpicker.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcolorpicker.c b/gtk/gtkcolorpicker.c
index b3ac5dce78..d57ffe016e 100644
--- a/gtk/gtkcolorpicker.c
+++ b/gtk/gtkcolorpicker.c
@@ -51,9 +51,18 @@ gtk_color_picker_pick_finish (GtkColorPicker  *picker,
 GtkColorPicker *
 gtk_color_picker_new (void)
 {
+  GtkColorPicker *picker;
+
   if (gtk_should_use_portal ())
-    return gtk_color_picker_portal_new ();
+    picker = gtk_color_picker_portal_new ();
+  else
+    picker = gtk_color_picker_shell_new ();
+
+  if (picker)
+    g_debug ("Using %s for picking colors", g_type_name_from_instance (picker));
   else
-    return gtk_color_picker_shell_new ();
+    g_debug ("No suitable GtkColorPicker implementation\n");
+
+  return picker;
 }