vim-55/src/gui_gtk_x11.c

2469     GtkWidget *sbar;
2482     sbar = firstwin->w_scrollbars[SBAR_LEFT].id;
2483     if (!sbar || (!gui.which_scrollbars[SBAR_LEFT]
2485 	sbar = firstwin->w_scrollbars[SBAR_RIGHT].id;
2486     if (sbar && GTK_WIDGET_REALIZED(sbar) && sbar->allocation.width)
2487 	gui.scrollbar_width = sbar->allocation.width;
2489     sbar = gui.bottom_sbar.id;
2490     if (sbar && GTK_WIDGET_REALIZED(sbar) && sbar->allocation.height)
2491 	gui.scrollbar_height = sbar->allocation.height;