window--resize-reset

window--resize-reset is a compiled Lisp function in `window.el'.

(window--resize-reset &optional FRAME HORIZONTAL)

Reset resize values for all windows on FRAME.
FRAME defaults to the selected frame.

This function stores the current value of `window-size' applied
with argument HORIZONTAL in the new total size of all windows on
FRAME. It also resets the new normal size of each of these
windows.