GNU Emacs 23.1.50.1 (i386-mingw-nt5.1.2600) of 2009-09-22 on LEKTU Compiled with gcc (4.3.3-tdm-1-dw2 mingw32) 4.3.3-dw2 I put the attached files into directory C:\temp, including the file test.el: (setq resize-mini-windows t) (setq ido-enable-flex-matching t) (setq ido-max-prospects 14) (ido-mode 1) Then, emacs -Q -l c:/temp/test.el C-x C-f c:/temp/testfile 3 7 Emacs aborts. (Note: As the failure depends on the number of lines in the minibuffer, tweaking `ido-max-prospects' and/or adding more files to the directory may be necessary to reproduce the bug.) The xassert (delta >= 0) at the start of window.c:grow_mini_window fails, because delta == -1. In resize_mini_window, the call to xdisp.c:grow_mini_window has height == 5 and WINDOW_TOTAL_LINES (w) == 6. Juanma Breakpoint 1, w32_abort () at w32fns.c:7344 7344 button = MessageBox (NULL, (gdb) bt #0 w32_abort () at w32fns.c:7344 #1 0x011b929c in grow_mini_window (w=0x2f9ec00, delta=-1) at window.c:4637 #2 0x0106d122 in resize_mini_window (w=0x2f9ec00, exact_p=0) at xdisp.c:8809 #3 0x01075952 in redisplay_internal (preserve_echo_area=0) at xdisp.c:11536 #4 0x01073682 in redisplay () at xdisp.c:11031 #5 0x0100c78b in read_char (commandflag=1, nmaps=3, maps=0x82e1e0, prev_event=48273409, used_mouse_menu=0x82e3c4, end_time=0x0) at keyboard.c:2707 #6 0x0101eb23 in read_key_sequence (keybuf=0x82e60c, bufsize=30, prompt=48273409, dont_downcase_last=0, can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9464 #7 0x01007a9a in command_loop_1 () at keyboard.c:1640 #8 0x01039cb2 in internal_condition_case (bfun=0x1007276 , handlers=48337089, hfun=0x10069ec ) at eval.c:1513 #9 0x01006e85 in command_loop_2 () at keyboard.c:1357 #10 0x0103970b in internal_catch (tag=48447137, func=0x1006e65 , arg=48273409) at eval.c:1249 #11 0x01006dee in command_loop () at keyboard.c:1322 #12 0x01006143 in recursive_edit_1 () at keyboard.c:951 #13 0x0118feae in read_minibuf (map=52443485, initial=48273409, prompt=49230995, backup_n=0, expflag=0, histvar=54300225, histpos=0, defalt=48273409, allow_props=0, inherit_input_method=0) at minibuf.c:739 #14 0x01193225 in Fcompleting_read (prompt=49230995, collection=48635549, predicate=48273409, require_match=48273409, initial_input=48273409, hist=54300225, def=48273409, inherit_input_method=48273409) at minibuf.c:1823 #15 0x0103df96 in Ffuncall (nargs=7, args=0x82eab0) at eval.c:3076 #16 0x011df195 in Fbyte_code (bytestr=51766515, vector=49979972, maxdepth=56) at bytecode.c:678 #17 0x0103beb5 in Feval (form=48635773) at eval.c:2382 #18 0x0103970b in internal_catch (tag=49728209, func=0x103b477 , arg=48635773) at eval.c:1249 #19 0x011dfdba in Fbyte_code (bytestr=54186131, vector=52804612, maxdepth=176) at bytecode.c:853 #20 0x0103e7a9 in funcall_lambda (fun=50993028, nargs=6, arg_vector=0x82f1d4) at eval.c:3232 #21 0x0103e005 in Ffuncall (nargs=7, args=0x82f1d0) at eval.c:3091 #22 0x011df195 in Fbyte_code (bytestr=51674739, vector=50023940, maxdepth=64) at bytecode.c:678 #23 0x0103e7a9 in funcall_lambda (fun=50992164, nargs=1, arg_vector=0x82f4f4) at eval.c:3232 #24 0x0103e005 in Ffuncall (nargs=2, args=0x82f4f0) at eval.c:3091 #25 0x011df195 in Fbyte_code (bytestr=49722835, vector=54198164, maxdepth=16) at bytecode.c:678 #26 0x0103e7a9 in funcall_lambda (fun=50348772, nargs=0, arg_vector=0x82f834) at eval.c:3232 #27 0x0103e005 in Ffuncall (nargs=1, args=0x82f830) at eval.c:3091 #28 0x0103d017 in apply1 (fn=49253217, arg=48273409) at eval.c:2786 #29 0x011e2be5 in Fcall_interactively (function=49253217, record_flag=48273409, keys=48306948) at callint.c:395 #30 0x0103dbdc in Ffuncall (nargs=4, args=0x82faf8) at eval.c:3051 #31 0x0103d119 in call3 (fn=48471425, arg1=49253217, arg2=48273409, arg3=48273409) at eval.c:2871 #32 0x01023a41 in Fcommand_execute (cmd=49253217, record_flag=48273409, keys=48273409, special=48273409) at keyboard.c:10453 #33 0x0100a993 in command_loop_1 () at keyboard.c:1901 #34 0x01039cb2 in internal_condition_case (bfun=0x1007276 , handlers=48337089, hfun=0x10069ec ) at eval.c:1513 #35 0x01006e85 in command_loop_2 () at keyboard.c:1357 #36 0x0103970b in internal_catch (tag=48333209, func=0x1006e65 , arg=48273409) at eval.c:1249 #37 0x01006e3c in command_loop () at keyboard.c:1336 #38 0x01006143 in recursive_edit_1 () at keyboard.c:951 #39 0x01006618 in Frecursive_edit () at keyboard.c:1013 #40 0x01002a8d in main (argc=4, argv=0xa92840) at emacs.c:1827 Lisp Backtrace: "completing-read" (0x82eab4) "byte-code" (0x82ed40) "ido-read-internal" (0x82f1d4) "ido-file-internal" (0x82f4f4) "ido-find-file" (0x82f834) "call-interactively" (0x82fafc) (gdb)