get rid of tracking adjustments

They are not used anywere, and do not seem to become useful anymore in
the light of the new separation of document and view.

callbacks.c

@@ -218,36 +218,6 @@ cb_refresh_view(GtkWidget* GIRARA_UNUSED(view), gpointer data)
   statusbar_page_number_update(zathura);
 }
 
-void
-cb_adjustment_track_value(GtkAdjustment* adjustment, gpointer data)
-{
-  GtkAdjustment* tracker = data;
-
-  gdouble lower = gtk_adjustment_get_lower(adjustment);
-  gdouble upper = gtk_adjustment_get_upper(adjustment);
-  if (lower != gtk_adjustment_get_lower(tracker) ||
-      upper != gtk_adjustment_get_upper(tracker)) {
-    return;
-  }
-
-  gdouble value = gtk_adjustment_get_value(adjustment);
-  gtk_adjustment_set_value(tracker, value);
-}
-
-void
-cb_adjustment_track_bounds(GtkAdjustment* adjustment, gpointer data)
-{
-  GtkAdjustment* tracker = data;
-  gdouble value = gtk_adjustment_get_value(adjustment);
-  gdouble lower = gtk_adjustment_get_lower(adjustment);
-  gdouble upper = gtk_adjustment_get_upper(adjustment);
-  gdouble page_size = gtk_adjustment_get_page_size(adjustment);
-  gtk_adjustment_set_value(tracker, value);
-  gtk_adjustment_set_lower(tracker, lower);
-  gtk_adjustment_set_upper(tracker, upper);
-  gtk_adjustment_set_page_size(tracker, page_size);
-}
-
 void
 cb_page_layout_value_changed(girara_session_t* session, const char* UNUSED(name), girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
 {

callbacks.h

@@ -49,9 +49,7 @@ void cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data)
  * This function gets called when the bounds or the page_size of the horizontal
  * scrollbar change (e.g. when the zoom level is changed).
  *
- * It adjusts the value of the horizontal scrollbar, possibly based on its
- * previous adjustment, stored in the tracking adjustment
- * zathura->ui.hadjustment.
+ * It adjusts the value of the horizontal scrollbar
  *
  * @param adjustment The horizontal adjustment of a gtkScrolledWindow
  * @param data The zathura instance
@@ -81,27 +79,6 @@ void cb_view_vadjustment_changed(GtkAdjustment *adjustment, gpointer data);
  */
 void cb_refresh_view(GtkWidget* view, gpointer data);
 
-/* This function gets called when the value of the adjustment changes.
- *
- * It updates the value of the tracking adjustment, only if the bounds of the
- * adjustment have not changed (if they did change,
- * cb_adjustment_track_bounds() will take care of updating everything).
- *
- * @param adjustment The adjustment instance
- * @param data The tracking adjustment instance
- */
-void cb_adjustment_track_value(GtkAdjustment* adjustment, gpointer data);
-
-/* This function gets called when the bounds or the page_size of the adjustment
- * change.
- *
- * It updates the value, bounds and page_size of the tracking adjustment.
- *
- * @param adjustment The adjustment instance
- * @param data The tracking adjustment instance
- */
-void cb_adjustment_track_bounds(GtkAdjustment* adjustment, gpointer data);
-
 /**
  * This function gets called when the value of the "pages-per-row"
  * variable changes

zathura.c

@@ -160,37 +160,23 @@ zathura_init(zathura_t* zathura)
 
   g_signal_connect(G_OBJECT(zathura->ui.session->gtk.window), "size-allocate", G_CALLBACK(cb_view_resized), zathura);
 
-  /* Setup hadjustment tracker */
   GtkAdjustment* hadjustment = gtk_scrolled_window_get_hadjustment(
-      GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
-  zathura->ui.hadjustment = zathura_adjustment_clone(hadjustment);
-  g_object_ref_sink(zathura->ui.hadjustment);
+                 GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
 
   /* Connect hadjustment signals */
   g_signal_connect(G_OBJECT(hadjustment), "value-changed",
       G_CALLBACK(cb_view_hadjustment_value_changed), zathura);
-  g_signal_connect(G_OBJECT(hadjustment), "value-changed",
-      G_CALLBACK(cb_adjustment_track_value), zathura->ui.hadjustment);
   g_signal_connect(G_OBJECT(hadjustment), "changed",
       G_CALLBACK(cb_view_hadjustment_changed), zathura);
-  g_signal_connect(G_OBJECT(hadjustment), "changed",
-      G_CALLBACK(cb_adjustment_track_bounds), zathura->ui.hadjustment);
 
-  /* Setup vadjustment tracker */
   GtkAdjustment* vadjustment = gtk_scrolled_window_get_vadjustment(
-      GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
-  zathura->ui.vadjustment = zathura_adjustment_clone(vadjustment);
-  g_object_ref_sink(zathura->ui.vadjustment);
+                 GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
 
   /* Connect vadjustment signals */
   g_signal_connect(G_OBJECT(vadjustment), "value-changed",
       G_CALLBACK(cb_view_vadjustment_value_changed), zathura);
-  g_signal_connect(G_OBJECT(vadjustment), "value-changed",
-      G_CALLBACK(cb_adjustment_track_value), zathura->ui.vadjustment);
   g_signal_connect(G_OBJECT(vadjustment), "changed",
       G_CALLBACK(cb_view_vadjustment_changed), zathura);
-  g_signal_connect(G_OBJECT(vadjustment), "changed",
-      G_CALLBACK(cb_adjustment_track_bounds), zathura->ui.vadjustment);
 
   /* page view alignment */
   zathura->ui.page_widget_alignment = gtk_alignment_new(0.5, 0.5, 0, 0);
@@ -297,13 +283,6 @@ zathura_free(zathura_t* zathura)
     girara_session_destroy(zathura->ui.session);
   }
 
-  if (zathura->ui.hadjustment != NULL) {
-    g_object_unref(G_OBJECT(zathura->ui.hadjustment));
-  }
-  if (zathura->ui.vadjustment != NULL) {
-    g_object_unref(G_OBJECT(zathura->ui.vadjustment));
-  }
-
   /* stdin support */
   if (zathura->stdin_support.file != NULL) {
     g_unlink(zathura->stdin_support.file);

zathura.h

@@ -69,9 +69,6 @@ struct zathura_s
     GtkWidget *page_widget_alignment;
     GtkWidget *page_widget; /**< Widget that contains all rendered pages */
     GtkWidget *index; /**< Widget to show the index of the document */
-
-    GtkAdjustment *hadjustment; /**< Tracking hadjustment */
-    GtkAdjustment *vadjustment; /**< Tracking vadjustment */
   } ui;
 
   struct