[gtk/peek-password] Add a default implementation of strength

[Matthias Clasen <matthiasc src gnome org>]

commit 13edad81a798ae809cc192e8ff93487111a42972
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Mar 14 01:20:43 2019 -0400

    Add a default implementation of strength
    
    This is too simple to be useful, but its a start.

 gtk/gtkpasswordentry.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkpasswordentry.c b/gtk/gtkpasswordentry.c
index a5e9343418..6c5c337005 100644
--- a/gtk/gtkpasswordentry.c
+++ b/gtk/gtkpasswordentry.c
@@ -537,10 +537,17 @@ update_strength (GObject          *object,
 {
   GtkPasswordEntryPrivate *priv = gtk_password_entry_get_instance_private (entry);
 
-  int strength = 0;
+  int strength = -1;
 
   g_signal_emit (entry, signals[GET_STRENGTH], 0, &strength);
 
+  if (strength == -1)
+    {
+      const char *text = gtk_editable_get_text (GTK_EDITABLE (priv->entry));
+
+      strength = CLAMP (0, 100, 10 * g_utf8_strlen (text, -1));
+    }
+
   gtk_level_bar_set_value (GTK_LEVEL_BAR (priv->strength_widget), strength);
 }