[Qt4-preview-feedback] QTextCursor::insertFrame() Assertion Failure in 4.5.0-rc1

[Franusich, Michael D.]

I have a block of code that calls QTextCursor::insertFrame() and then adds some formatted text to a QTextDocument.  After repeated calls to insertFrame() there is an assertion failure in QTextDocumentPrivate::insertFrame():

Q_ASSERT(end >= 0 && end < length());

The end and start arguments look good in the debugger, so the problem must be with length(), which I can't see in the debugger.  That function is defined in qtextdocument_p.h:

inline int length() const { return fragments.length(); }

As this code has worked fine from 4.3.x through 4.5.0-beta1 it is suspicious that one of the few changes in src/gui/text is in QTextCopyHelper::appendFragment() in qtextdocumentfragment.cpp

122,123c122,127
<                 blockIdx = convertFormatIndex(nextBlock.blockFormat());
<                 dst->insertBlock(insertPos, blockIdx, charFormatIndex);
---
>                 // insert a new text block with the block and char format from the
>                 // source block to make sure that the following text fragments
>                 // end up in a list as they should
>                 int listBlockFormatIndex = convertFormatIndex(nextBlock.blockFormat());
>                 int listCharFormatIndex = convertFormatIndex(nextBlock.charFormat());
>                 dst->insertBlock(insertPos, listBlockFormatIndex, listCharFormatIndex);



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