gui_toolkit 0.111.1

Fixed

• Linux: the loop sleeps at rest again: the system's repaint request (a configure, an expose) stayed set, so every hosts_wait ended at once and a window drew frames for ever (60 a second; a core for a hidden one). host_frame now takes the request (its frame answers it), and a hidden window's request ends no wait. tests/linux_desktop checks that no frame is due at rest.