Number of lines to scroll with CTRL-U and CTRL-D commands. Will be set to half the number of lines in the window when the window size changes. This may happen when enabling the status-line or 'tabline' option after setting the 'scroll' option. If you give a count to the CTRL-U or CTRL-D command it will be used as the new value for 'scroll'. Reset to half the window height with ":set scroll=0".

(default: half the window height)