[maxmsp] textedit bug!

hello.

i had troubles with a patch which crashed randomly, at least it seemed randomly...

on windows max crashed with this error-message:

__________________________
Microsoft Visual C++ Runtime Library

Runtime Error!

Program C:\.....program

R6025
- pure virtual function call
___________________________

i figured out, that this was related to an error an mxj-object threw (net.multi.send)



i broke the crashes down to the textedit object.
(i used it to be able to debug in runtime-version without the status window)


there seems to be a maximum number of lines the textedit object is able to handle. the maximum count of lines depends on the length of the appended text, and the platform...

i wrote a test-patch, which writes a counting number to a file, before appending a text.
a sentence with the length of 21 characters could be appended 1024 times on a mac, and 1365 time on windows (both max 4.6.3) - a word with 5 characters could be appended 2048 time on a mac and 2731 time on windows... with a longer text, max crashed earlier.


here is a patch:

#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P comment 472 131 100 196617 turn on;
#P comment 472 116 100 196617 2.;
#P comment 637 183 100 196617 1.;
#P comment 608 246 136 196617 <- press here to get linefeed;
#P message 512 192 21 196617 inc;
#P newex 449 174 30 196617 t b b;
#P number 512 234 50 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P user incdec 512 213 15 15 0 0;
#P toggle 449 131 15 0;
#P newex 449 152 52 196617 metro 20;
#P newex 574 283 62 196617 prepend set;
#P message 359 114 33 196617 clear;
#P newex 449 278 78 196617 prepend append;
#P message 449 259 104 196617 crash coming soon ...;
#P newex 449 301 53 196617 append br;
#P newex 574 263 40 196617 itoa;
#P message 574 244 20 196617 13;
#P newex 574 225 48 196617 loadbang;
#P user textedit 102 130 392 563 32816 3 9;
#P window linecount 3;
#P comment 635 198 100 196617 if you pasted the patch \, the loadbang does not go off.;
#P hidden connect 8 0 1 0;
#P hidden connect 5 0 1 0;
#P connect 6 0 7 0;
#P connect 7 0 5 0;
#P connect 9 0 5 0;
#P connect 2 0 3 0;
#P connect 3 0 4 0;
#P connect 4 0 9 0;
#P connect 11 0 10 0;
#P connect 12 0 13 0;
#P connect 10 0 14 0;
#P connect 14 0 6 0;
#P connect 15 0 12 0;
#P connect 14 1 15 0;
#P window clipboard copycount 20;


you can avoid the crash by clearing the textedit-object...


reproducable?

some solutions?

greets
ingo