[QScintilla] Odd crash with autocompletion

[Randall Frank]

Hello,
    I built a little editor for Python scripts using
QScintilla and registered some of my own Python API
for autocompletion.  When I run this, the first
autocompletion works just fine, the second time
I trigger the autocomplete popup, I get a crash
looking something like this:

#0  0x00002b95ca782380 in QsciAPIs::positionOrigin (this=0x686880,
     context=@0x7fffe05b6c40, path=@0x7fffe05b6b30) at qsciapis.cpp:329
#1  0x00002b95ca782ad4 in QsciAPIs::updateAutoCompletionList (this=0x686880,
     context=@0x7fffe05b6c40, list=@0x7fffe05b6c20) at qsciapis.cpp:407
#2  0x00002b95ca779471 in QsciScintilla::startAutoCompletion (this=0x763de0,
     acs=QsciScintilla::AcsAPIs, checkThresh=false, single=false)
     at qsciscintilla.cpp:660
#3  0x00002b95ca779c3e in QsciScintilla::handleCharAdded (this=0x763de0, 
ch=46)
     at qsciscintilla.cpp:232

I am building the objects like this:

     lexer = new QsciLexerPython();
     lexer->setDefaultFont( getDefaultEditorFont() );
     lexer->setFont( getDefaultEditorFont() );
     API = new QsciAPIs(lexer);
     lexer->setAPIs(API);
     text->setLexer(lexer);

     text->setMarginWidth(0,QString("00000"));
     text->setMarginLineNumbers(0,TRUE);
     text->setMarginWidth(2,QString("00000"));
     QFont my_font2(  text->font() );
     my_font2.setStyleHint( QFont::TypeWriter );
     my_font2.setFixedPitch( TRUE );
     text->setEolMode(QsciScintilla::EolUnix);
     text->setMarginsFont( my_font2 );
     text->setFolding(QsciScintilla::CircledTreeFoldStyle);

     text->setIndentationGuides(TRUE);
     text->setIndentationsUseTabs(FALSE);
     text->setIndentationWidth(4);
     text->setAutoIndent(TRUE);
     text->setTabIndents(TRUE);
     text->setTabWidth(4);

I fill API with code like this:

     FILE *fp = fopen("lines","r");
     char tstr[100];
     while(fgets(tstr,sizeof(tstr)-1,fp)) {
        API->add(tstr+8);
     }
     fclose(fp);

     menuAutoComplete->setEnabled(FALSE);
     API->prepare();
     connect( API, SIGNAL( apiPreparationFinished() ), this,
              SLOT( apiPrepared() ));


Where apiPrepared() enables the menuAutoComplete QAction
toggle.  Finally, I am enabling autocompletion using a
menu with the following method:

void EnsScriptEditor::toggleAutoComplete( bool on)
{
     text->setAutoCompletionSource(on ? QsciScintilla::AcsAPIs : 
QsciScintilla::AcsNone);
}


I guess the first question is what am I doing wrong?
The second would be has anyone else see this type of
behavior?

I have a small (single file) example app that exhibits
the crash.  The odd part is that it works properly
for the first autocompletion.  FYI: I get the same
crash with 64bit Linux and 64bit Windows XP.

I have tried QScintilla commercial 2.2 and 2.3
with Qt 4.4.1.

Thanks.
-- 
rjf
------------------------------------------------------
Randall Frank     rjfrank at ensight.com     919-363-0883
Computational Engineering International www.ceintl.com
2166 North Salem St,  Suite 101,  Apex,  NC 27523-6456