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[Mitsuhiro Yoshida <628113@xxxxxxxxxxxxxxxxxx>]

Yes, you are right.
But using 'javascript:history.back()' is the easiest way to avoid Back link loop.

-- 
Using javascript for Back link
https://bugs.launchpad.net/bugs/628113
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Status in Mahara ePortfolio: New

Bug description:
Now we are using $_SERVER['HTTP_REFERER'] to get a previous view page.
But for example the following 2nd case, we can not go back to the Top Page.

1. Top Page > Links and Resources > Site view 001 > Back > Top Page
2. Top Page > Links and Resources > Site view 001 > Public view by user001 > Back > Site view 001 > Back > public view by user001 > Back > Site view 001

So how about changing view/view.php as below?

File: view/view.php
Line: 179

[ Before ]
if ($USER->is_logged_in() && !empty($_SERVER['HTTP_REFERER'])) {
    $page = get_config('wwwroot') . 'view/view.php?id=' . $viewid . ($new ? '&new=1' : '');
    if ($_SERVER['HTTP_REFERER'] != $page) {
        $smarty->assign('backurl', $_SERVER['HTTP_REFERER']);
    }
}

[ After ]
if ($USER->is_logged_in() && !empty($_SERVER['HTTP_REFERER'])) {
    $page = get_config('wwwroot') . 'view/view.php?id=' . $viewid . ($new ? '&new=1' : '');
    if ($_SERVER['HTTP_REFERER'] != $page) {
        $smarty->assign('backurl', 'javascript:history.back()');
    }
}