Fix crash when scrolling too far up

It mostly just looked weird when the underline wasn't on the last row.

nncmpp.c

@@ -28,7 +28,7 @@
 	XX( REMAINS,     remains,      -1, -1, A_UNDERLINE ) \
 	/* Tab bar                                        */ \
 	XX( TAB_BAR,     tab_bar,      -1, -1, A_REVERSE   ) \
-	XX( TAB_ACTIVE,  tab_active,   -1, -1, A_UNDERLINE ) \
+	XX( TAB_ACTIVE,  tab_active,   -1, -1, A_BOLD      ) \
 	/* Listview                                       */ \
 	XX( HEADER,      header,       -1, -1, A_UNDERLINE ) \
 	XX( EVEN,        even,         -1, -1, 0           ) \
@@ -2961,6 +2961,7 @@ app_process_left_mouse_click (struct widget *w, int x, int y, int modifiers)
 		tab->item_top = (double) y / w->height
 			* (int) tab->item_count - visible_items / 2;
 		app_invalidate ();
+		app_fix_view_range ();
 		break;
 	}
 	case WIDGET_MESSAGE: