XGetWMColormapWindows(3) on Linux
The text 4e2811c42c55, as Debian 12 (Bookworm) shipped it.
set or read a window's WM_COLORMAP_WINDOWS property
The text 4e2811c42c55, as Debian 12 (Bookworm) shipped it.
set or read a window's WM_COLORMAP_WINDOWS property