Function: window-next-sibling
window-next-sibling is a function defined in window.c.
Signature
(window-next-sibling &optional WINDOW)
Documentation
Return the next sibling window of window WINDOW.
WINDOW must be a valid window and defaults to the selected one. Return nil if WINDOW has no next sibling.
Source Code
// Defined in /usr/src/emacs/src/window.c
{
return decode_valid_window (window)->next;
}