With rev#79903 experimental, I don't get a precondition violation but a postcondition violation:

option_set: Postcondition violated. (POSTCONDITION_VIOLATION)
-------------------------------------------------------------------------------
Class / Object      Routine                Nature of exception           Effect
-------------------------------------------------------------------------------
EV_RICH_TEXT_IMP    internal_change_word_wrapping @35
                                           option_set:
<0000000003B210EC>                         Postcondition violated.       Fail
-------------------------------------------------------------------------------
EV_RICH_TEXT_IMP    internal_change_word_wrapping @35
<0000000003B210EC>                         Routine failure.              Fail
-------------------------------------------------------------------------------
EV_RICH_TEXT_IMP    disable_word_wrapping @1
<0000000003B210EC>                         Routine failure.              Fail
-------------------------------------------------------------------------------
EV_RICH_TEXT        disable_word_wrapping @2
<0000000002DF9F3C>  (From EV_TEXT)         Routine failure.              Fail
-------------------------------------------------------------------------------
MAIN_WINDOW         build_main_container @9
<0000000002DF1920>                         Routine failure.              Fail
-------------------------------------------------------------------------------
MAIN_WINDOW         initialize @3                                       
<0000000002DF1920>                         Routine failure.              Fail
-------------------------------------------------------------------------------
MAIN_WINDOW         default_create @6                                   
<0000000002DF1920>  (From EV_ANY)          Routine failure.              Fail
-------------------------------------------------------------------------------
APPLICATION         prepare @1                                          
<0000000002DF0420>                         Routine failure.              Fail
-------------------------------------------------------------------------------
APPLICATION         make_and_launch @2                                  
<0000000002DF0420>                         Routine failure.              Fail
-------------------------------------------------------------------------------
APPLICATION         root's creation                                     
<0000000002DF0420>                         Routine failure.              Exit
-------------------------------------------------------------------------------

Call stack:

ObjectClassRoutine
------------------
[0x38567F4] EV_RICH_TEXT_IMP internal_change_word_wrapping ( @ 35 )
[0x38567F4] EV_RICH_TEXT_IMP disable_word_wrapping ( @ 1 )
[0x38567FC] EV_RICH_TEXT disable_word_wrapping (From EV_TEXT) ( @ 2 )
[0x3856800] MAIN_WINDOW build_main_container <*> ( @ 9 )
[0x3856800] MAIN_WINDOW initialize ( @ 3 )
[0x3856800] MAIN_WINDOW default_create (From EV_ANY) ( @ 6 )
[0x3856804] APPLICATION prepare ( @ 1 )
[0x3856804] APPLICATION make_and_launch ( @ 2 )