XIconSize(3) on Linux
The text 3f12abfb9b2d, as Debian 9 (Stretch) shipped it.
allocate icon size structure and set or read a window's WM_ICON_SIZES property
The text 3f12abfb9b2d, as Debian 9 (Stretch) shipped it.
allocate icon size structure and set or read a window's WM_ICON_SIZES property