Delete the rest of the line.

def commit(self):
        """
        Delete the rest of the line.
        """

        # Get the text cursor for the current document and unselect
        # everything.
        tc = self.qteWidget.textCursor()
        tc.clearSelection()

        # If this is the first ever call to this undo/redo element then
        # backup the current cursor position and the selected text (may be
        # none). This information will be required for the redo operation
        # to position the cursor (and selected text) where it was at the
        # very first call.
        if self.cursorPos0 is None:
            self.cursorPos0 = tc.position()
        else:
            tc.setPosition(self.cursorPos0, QtGui.QTextCursor.MoveAnchor)

        # Insert the element and keep track of how much the cursor has
        # moved. This is trivial to determine automatically if
        # `yankText` is pure text, but if it is HTML code then it is
        # safer to rely on Qt's builtin ``position`` method.
        if self.textType:
            tc.insertText(self.yankText)
        else:
            tc.insertHtml(self.yankText)
        self.cursorPos1 = tc.position()

        # Apply the changes.
        self.qteWidget.setTextCursor(tc)