Remove the inserted character(s).

def reverseCommit(self):
        """
        Remove the inserted character(s).
        """

        # Move the cursor to the right of the text to delete.
        tc = self.qteWidget.textCursor()

        # Delete as many characters as necessary. For an image that would
        # be exactly 1 even though the HTML code to embed that image is usually
        # longer. For text, it would be as many characters as the pasted text
        # was long.
        if self.isImage:
            dataLen = 1
        else:
            dataLen = len(self.data)

        tc.setPosition(self.selStart + dataLen, QtGui.QTextCursor.MoveAnchor)
        for ii in range(dataLen):
            tc.deletePreviousChar()

        # Add the previously selected text (this may be none).
        tc.insertHtml(self.selText)
        self.qteWidget.setTextCursor(tc)