Don't prompt for reload confirmation if keeping edit history

No work is lost in that case (except for the redo stack, which is
normal), so the extra confirmation step seems bothersome.

src/callbacks.c

@@ -428,8 +428,9 @@ G_MODULE_EXPORT void on_reload_as_activate(GtkMenuItem *menuitem, gpointer user_
 		charset = doc->encoding;
 
 	base_name = g_path_get_basename(doc->file_name);
-	/* don't prompt if file hasn't been edited at all */
-	if ((!doc->changed && !document_can_undo(doc) && !document_can_redo(doc)) ||
+	/* don't prompt if edit history is maintained, or if file hasn't been edited at all. */
+	if (file_prefs.keep_edit_history_on_reload ||
+		(!doc->changed && !document_can_undo(doc) && !document_can_redo(doc)) ||
 		dialogs_show_question_full(NULL, _("_Reload"), GTK_STOCK_CANCEL,
 		_("Any unsaved changes will be lost."),
 		_("Are you sure you want to reload '%s'?"), base_name))