Bug#419183: gs-esp crashes when zooming in gv

[vwf <vwf@vulkor.net>]

Package: gs-esp
Version: 8.15.3.dfsg.1-1

How to reproduce the error:
1- Open a proper Postscript file in gv (v3.6.2) 
  (I use files generated with latex and dvips, self made and versions that
  come with packages)
2- Zoom >=4
3- Crash


ERROR: /unknownerror in --%op_show_continue--
Operand stack:
   -16
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1   3   %oparray_pop   1   3   %oparray_pop   1   3   %oparray_pop   1   3   %oparray_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1125/1686(ro)(G)--   --dict:0/20(G)--   --dict:103/200(L)--   --dict:101/300(L)--
Current allocation mode is local
ESP Ghostscript 815.03: Unrecoverable error, exit code 1

All on etch, after upgrading from sarge
Linux host 2.6.13.4 #8 Wed Mar 28 08:51:18 CEST 2007 i686 GNU/Linux
libc: Version: 2.3.6.ds1-13