🚀 go-pugleaf

Description:
	Windowing back with a count greater than 1 fails.
Repeat-By:
	Preceding a CTRL-b by a count greater than 1 (e.g. 3CTRL-b) either
	results in the cursor addressing the wrong line, or a core dump.
	Occurs with version 7.3 of ex_vmain.c on our 4.2 system.
Fix:
	The fix to this problem is trivial.  Edit ex_vmain.c and make the
	following change:

ex_vmain.c.old:
		case CTRL(b):
			vsave();
			if (one + vcline != dot && vcnt > 2) {
->				addr = dot - vcline + 2 + (cnt-1)*basWLINES;
				forbid (addr <= zero);
				dot = addr;
				vcnt = vcline = 0;
			}
============================================================================
ex_vmain.c.new:
		case CTRL(b):
			vsave();
			if (one + vcline != dot && vcnt > 2) {
->				addr = dot - vcline + 2 - (cnt-1)*basWLINES;
				forbid (addr <= zero);
				dot = addr;
				vcnt = vcline = 0;
			}
============================================================================

				Robert Lake (alberta!lake)
				University of Alberta