How to trace removal of image from QTextEdit?

How can I trace removal of image from QTextEdit and get then path to this image?
I paste image with

Code:

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QString subtext = QString("<img src=\"%1\" />").arg(fileimg);
QTextDocumentFragment fragment = QTextDocumentFragment::fromHtml(subtext);
textEdit->textCursor().insertFragment(fragment);

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P.S. Sorry for my English :)