Correctly show changes when total goes down

* src/data.c (data_update_manga): When updating, set `current_qty' to
  the lesser of `current_qty' and `total_qty' so that current will
  never exceed total.  If the update went well remove any volumes that
  have numbers greater than the `total_qty'.

* src/eom-detail-window.c (eom_detail_window_load): Get to upper bound
  of rows, if I need 1.5 rows I actually need 2 rows, what was I
  thinking?  Clear both tables of children before filling them up
  again.
  (cb_destroy): New function.  Just calls destroy in `widget', but
  `gtk_widget_destroy' doesn't seem like a valid `GtkCallback'.
  (on_volume_toggled): When adding a volume fails, revert one from
  `current_qty'.  Don't mess with `self->manga->current_qty', just
  reset the manga id, otherwise we will know that there should be one
  more or less volume, but won't show it in the manga's volumes
  collection.

src/data.c

@@ -239,12 +239,24 @@ gboolean
 data_update_manga(gint manga_id, const gchar *name, gint total_qty)
 {
     gchar *sql =
-        g_strdup_printf("UPDATE manga SET name = '%s', total_qty = %d "
+        g_strdup_printf("UPDATE manga SET "
-                        "WHERE id = %d", name, total_qty, manga_id);
+                        "       name = '%s', "
+                        "       total_qty = %d, "
+                        "       current_qty = MIN(current_qty, %d) "
+                        "WHERE id = %d", name, total_qty, total_qty,
+                        manga_id);
     gboolean ret = execute_non_query(sql);
 
     g_free(sql);
 
+    if (ret) {
+        sql = g_strdup_printf("DELETE FROM volume "
+                              "WHERE manga_id = %d "
+                              "AND id > %d",
+                              manga_id, total_qty);
+        ret = execute_non_query(sql);
+    }
+
     return ret;
 }
 

src/eom-detail-window.c

@@ -18,6 +18,7 @@ enum {
 };
 
 static void add_menu(EomDetailWindow*);
+static void cb_destroy(GtkWidget*, gpointer);
 static GtkWidget *create_volume_button(gchar*, GtkTable*, int, int);
 static void eom_detail_window_class_init(EomDetailWindowClass*);
 static void eom_detail_window_init(EomDetailWindow *self);
@@ -42,10 +43,12 @@ eom_detail_window_load(EomDetailWindow *self)
     if (!total_qty)
         total_qty = self->manga->current_qty + 1;
 
-    rows = (int)floor(total_qty / COLUMNS);
+    rows = (int)ceil(total_qty / COLUMNS);
 
     gtk_window_set_title(GTK_WINDOW(self), self->manga->name);
+    gtk_container_foreach(GTK_CONTAINER(self->ctable), cb_destroy, NULL);
     gtk_table_resize(GTK_TABLE(self->ctable), rows, COLUMNS);
+    gtk_container_foreach(GTK_CONTAINER(self->rtable), cb_destroy, NULL);
     gtk_table_resize(GTK_TABLE(self->rtable), rows, COLUMNS);
 
     for (i = 0; i < total_qty; i++) {
@@ -113,6 +116,12 @@ add_menu(EomDetailWindow *window)
                                           HILDON_APP_MENU(appmenu));
 }
 
+static void
+cb_destroy(GtkWidget *widget, gpointer user_data)
+{
+    gtk_widget_destroy(widget);
+}
+
 static GtkWidget *
 create_volume_button(gchar* text, GtkTable* table, int column, int row)
 {
@@ -264,26 +273,22 @@ on_volume_toggled(GtkToggleButton *togglebutton, gpointer user_data)
             return;
         }
         if (!data_add_volume_to_manga(self->manga->id, volume)) {
-            data_add_to_manga(self->manga->id, 1);
+            data_add_to_manga(self->manga->id, -1);
             return;
         }
-        self->manga->current_qty++;
     }
     else {
         /* Remove 1 from mangas collected */
         if (!data_add_to_manga(self->manga->id, -1)) {
             return;
         }
-        if (!data_remove_volume_from_manga(self->manga->id,
+        if (!data_remove_volume_from_manga(self->manga->id, volume)) {
-                                           volume)) {
             data_add_to_manga(self->manga->id, 1); /* Undo */
             return;
         }
-        self->manga->current_qty--;
     }
 
-    if (!self->manga->total_qty)
+    set_manga_id(self, self->manga->id);
-        eom_detail_window_load(self);
 }
 
 static void