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  1. Qt
  2. QTBUG-15777

Crash in QTextDocument::markContentsDirty when tried to mark code as dirty

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P1: Critical P1: Critical
    • 4.7.2
    • 4.7.1
    • GUI: Text handling
    • None
    • Reproduced on all platforms.
    • fd3fc0b34a891751e6a0849421e8cecd19481324

      The following code causes the crash on all platforms:

          QTextDocument doc(str);
    QTextCursor cursor(&doc);
    cursor.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor, 1);
    QSignalSpy spy(&doc, SIGNAL(contentsChanged()));
    doc.markContentsDirty(cursor.position(), cursor.block().length());

      Crash is happened in QTextDocument::markContentsDirty method. 

          d->documentChange(from, length);
    if (!d->inContentsChange) {
        d->lout->documentChanged(d->docChangeFrom, d->docChangeOldLength, d->docChangeLength);
        d->docChangeFrom = -1;
    }

      QAbstractTextDocumentLayout *lout variable is 0 by default.
      This code worked on 4.6.3. If this code is incorrect and layout should be always set before using QTextDocument we will have binary incompatibility between two Qt versions.

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            jiang Jiang Jiang
            vasyura Oleh Vasyura
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              Created:
              Updated:
              Resolved:

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