summary_step(summaryview, GTK_SCROLL_STEP_FORWARD);
else if (sel_last && node == GTK_CTREE_NODE_PREV(sel_last))
summary_step(summaryview, GTK_SCROLL_STEP_BACKWARD);
summary_step(summaryview, GTK_SCROLL_STEP_FORWARD);
else if (sel_last && node == GTK_CTREE_NODE_PREV(sel_last))
summary_step(summaryview, GTK_SCROLL_STEP_BACKWARD);