window--resize-root-window

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

(window--resize-root-window WINDOW DELTA HORIZONTAL IGNORE PIXELWISE)

Resize root window WINDOW vertically by DELTA lines.
HORIZONTAL non-nil means resize root window WINDOW horizontally
by DELTA columns.

IGNORE non-nil means ignore any restrictions imposed by fixed
size windows, `window-min-height' or `window-min-width' settings.

This function is only called by the frame resizing routines. It
resizes windows proportionally and never deletes any windows.