[crash] redisplay after widening

This is 100% reproducible. It does not happen on 20.4. System is mips-sgi-irix6.4. XEmacs 21.0-b54. To reproduce: 1. xemacs -vanilla 2. Do a `narrow-to-region' in *scratch* from halfway in the first line through the end of the buffer. 3. Do a `widen'. Notice that the beginning of the first line is not redisplayed. 4. Hit C-l. Boom! Here is the trace, etc...: (dbx) run -vanilla Process 5113 (xemacs) started Fatal error: assertion failed, file /sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/redisplay.c, line 6757, cur_elt >= 0 Process 5113 (xemacs) stopped on signal SIGABRT: Abort (see abort(3c)) (handler fatal_error_signal) at [_kill:15 +0x8,0xfaa56b8] Source (of /xlv24/patches/3269/work/irix/lib/libc/libc_n32_M4/signal/kill.s) not available for Process 5113 (dbx) where 1 _raise(0x13f9, 0x6, 0x0, 0x0, 0x0, 0x200e6c, 0xfb512f0, 0x200e70) ["/xlv24/patches/3269/work/irix/lib/libc/libc_n32_M4/signal/raise.c":25, 0xfaa5d70] 2 abort(0x13f9, 0x6, 0x0, 0x0, 0x0, 0x200e6c, 0xfb512f0, 0x200e70) ["/xlv24/patches/3269/work/irix/lib/libc/libc_n32_M4/gen/abort.c":44, 0xfa316ac] 3 assert_failed(file = 0x1027fd90 = "/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/redisplay.c", line = 6757, expr = 0x102800b8 = "cur_elt >= 0") ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/emacs.c":2605, 0x10090998] 4 start_with_line_at_pixpos(w = 0x1053d200, point = 126, pixpos = 282) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/redisplay.c":6757, 0x1018f6fc] 5 Fcenter_to_window_line(n = 272216068, window = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/window.c":4266, 0x1020ee90] 6 funcall_recording_as(recorded_as = 272339228, nargs = 2, args = 0x7ffb6cc0) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":3197, 0x1009a37c] 7 Ffuncall(nargs = 3, args = 0x7ffb6cc0) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":3238, 0x1009a804] 8 Fbyte_code(bytestr = 271924100, vector = 271924160, maxdepth = 7) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/bytecode.c":416, 0x100592e0] 9 funcall_lambda(fun = 271924200, nargs = 1, arg_vector = 0x7ffb7024) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":3597, 0x1009c154] 10 funcall_recording_as(recorded_as = 272537772, nargs = 1, args = 0x7ffb7020) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":3200, 0x1009a5dc] 11 Ffuncall(nargs = 2, args = 0x7ffb7020) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":3238, 0x1009a804] 12 Fcall_interactively(function = 272537772, record_flag = 272216068, keys = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/callint.c":949, 0x1005eed0] 13 Fcommand_execute(cmd = 272537772, record = 272216068, keys = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":2584, 0x10097c6c] 14 execute_command_event(command_builder = 0x1048ee80, event = 273857560) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/event-stream.c":4346, 0x100e3490] 15 Fdispatch_event(event = 273857560) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/event-stream.c":4637, 0x100e3e70] 16 Fcommand_loop_1() ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/cmdloop.c":579, 0x10066dd4] 17 command_loop_1(dummy = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/cmdloop.c":494, 0x10066a0c] 18 condition_case_1(handlers = 272216180, bfun = 0x100669d0, barg = 272216068, hfun = 0x10065e50, harg = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":1653, 0x100952e4] 19 command_loop_3() ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/cmdloop.c":256, 0x10066044] 20 command_loop_2(dummy = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/cmdloop.c":267, 0x100660a4] 21 internal_catch(tag = 272294368, func = 0x10066080, arg = 272216068, threw = (nil)) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/eval.c":1328, 0x10094c88] 22 initial_command_loop(load_me = 272216068) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/cmdloop.c":305, 0x100663c0] 23 xemacs_21_0_mips_sgi_irix6_4(argc = 2, argv = 0x7ffb7ea4, envp = 0x7ffb7eb0, restart = 0) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/emacs.c":1702, 0x1008eb58] 24 main(argc = 2, argv = 0x7ffb7ea4, envp = 0x7ffb7eb0) ["/sag1/u4/sag1_dev4/craffert/xemacs/xemacs-21.0-b54/src/emacs.c":2119, 0x1008fa88] 25 __start() ["/xlv22/ficus-jan23/work/irix/lib/libc/libc_n32_M4/csu/crt1text.s":166, 0x10041fc8] (dbx) up _raise: Source (of /xlv24/patches/3269/work/irix/lib/libc/libc_n32_M4/signal/raise.c) not available for Process 5113 (dbx) up abort: Source (of /xlv24/patches/3269/work/irix/lib/libc/libc_n32_M4/gen/abort.c) not available for Process 5113 (dbx) up assert_failed:2605 abort (); (dbx) up start_with_line_at_pixpos:6757 assert (cur_elt >= 0); (dbx) print cur_elt -1 (dbx) cont Lisp backtrace follows: center-to-window-line(nil nil) # bind (window n) recenter(nil) # bind (command-debug-status) call-interactively(recenter) # (condition-case ... . error) # (catch top-level ...) -- Colin