[gnome-todo] activatable: Remove unused signal

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 68a73dee347291f6925be1b88771d5f6eb18d1d2
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri May 1 11:00:18 2020 -0300

    activatable: Remove unused signal
    
    GtdProvider is a GObject and we can connect to 'notify', so we don't
    need this signal in GtdActivatable.

 src/interfaces/gtd-activatable.c | 20 --------------------
 1 file changed, 20 deletions(-)
---
diff --git a/src/interfaces/gtd-activatable.c b/src/interfaces/gtd-activatable.c
index bf9d4d3..ce87c15 100644
--- a/src/interfaces/gtd-activatable.c
+++ b/src/interfaces/gtd-activatable.c
@@ -54,7 +54,6 @@ G_DEFINE_INTERFACE (GtdActivatable, gtd_activatable, G_TYPE_OBJECT)
 enum
 {
   PROVIDER_ADDED,
-  PROVIDER_CHANGED,
   PROVIDER_REMOVED,
   NUM_SIGNALS
 };
@@ -95,25 +94,6 @@ gtd_activatable_default_init (GtdActivatableInterface *iface)
                                           1,
                                           GTD_TYPE_PROVIDER);
 
-  /**
-   * GtdActivatable::provider-changed:
-   * @activatable: a #GtdActivatable
-   * @provider: a #GtdProvider
-   *
-   * The ::provider-changed signal is emmited after a #GtdProvider
-   * has any of it's properties changed.
-   */
-  signals[PROVIDER_CHANGED] = g_signal_new ("provider-changed",
-                                            GTD_TYPE_ACTIVATABLE,
-                                            G_SIGNAL_RUN_LAST,
-                                            0,
-                                            NULL,
-                                            NULL,
-                                            NULL,
-                                            G_TYPE_NONE,
-                                            1,
-                                            GTD_TYPE_PROVIDER);
-
   /**
    * GtdActivatable::provider-removed:
    * @activatable: a #GtdActivatable