function reflow(&$parent, &$context)
{
// Check if there are any boxes in parent's line box
if ($parent->line_box_empty()) {
// The very first whitespace in the line box should not affect neither height nor baseline of the line box;
// because following boxes can be smaller that assumed whitespace height
// Example: <br>[whitespace]<img height="2" width="2"><br>; whitespace can overextend this line
$this->width = 0;
$this->height = 0;
} elseif (is_a($parent->last_in_line(), "WhitespaceBox")) {
// Duplicate whitespace boxes should not offset further content and affect the line box length
$this->width = 0;
$this->height = 0;
} elseif ($this->maybe_line_break($parent, $context)) {
$this->width = 0;
$this->height = 0;
}
parent::reflow($parent, $context);
}