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  1. Qt
  2. QTBUG-42223

QTextCursor::beginEditBlock() crash after replacing text with shorter text

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: P1: Critical P1: Critical
    • None
    • 5.4.0 Beta
    • GUI: Text handling
    • None
    • Macintosh OS X 10.9.5, Qt 5.4 recent stable branch checkout
      Windows 8.1, same Qt 5.4

      The sequence is:

      QTextCursor::beginEditBlock()
      a loop to find text and replace with shorter text
      QTextCursor::endEditBlock()
      QPlainTextEdit::setTextCursor() <=== CRASH

      Build the attached project with Qt 5.4. Click the Crash button, and it crashes on an assert:
      ASSERT failure in QVector<T>::operator[]: "index out of range", file ../../include/QtCore/../../../../../qt/qtbase/src/corelib/tools/qvector.h, line 396

      If you remove the call to QTextCursor::beginEditBlock(), the crash doesn't happen.

      Replacing text with longer text, no crash.

      Build with Qt 4.8.6, works as expected

      Crashes on both Macintosh and Windows

        1. QPlainTextEditCrash.zip
          4 kB
          John Weeks
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            esabraha Eskil Abrahamsen Blomfeldt
            johnweeks John Weeks
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              Created:
              Updated:
              Resolved:

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