updated for version 7.4.349 Problem: When there are matches to highlight the whole window is redrawn, which is slow. Solution: Only redraw everything when lines were inserted or deleted. Reset b_mod_xlines when needed. (Alexey Radkov)

/* pty.c */
int OpenPTY __ARGS((char **ttyn));
int SetupSlavePTY __ARGS((int fd));