[cvs-nhc98] Fix two bugs in hat-trail's help text when using a short t

malcolm: Wed Feb 26 17:59:33 CET 2003 Update of /usr/src/master/nhc/src/hat/tools In directory hinken:/tmp/cvs-serv22513 Modified Files: HatTrail.hs Log Message: Fix two bugs in hat-trail's help text when using a short terminal window. * Invoking :h from the initial "output/error" selection panes, the help text scrolls over the upper panes, and the display is corrupted on return. * Invoking :h later, the help text scrolls out of view behind the upper panes, and there is no way of knowing (a) that it has done so, and (b) what the hidden text says. The solution is to implement a simple 'more'-style viewer that adapts to the exact height of the lower (trail) pane.