Steps to reproduce the issue

User/group isn't allowed to insert link to article via XTD "Article" button when we want to limit users to edit its own articles.
"Global Configuration/Permissions settings", Edit Own == Allowed, function "Article" (XTD button) rise JERROR_ALERTNOAUTHOR message.

Expected result

User/group should be allowed to add article link even with core.edit.own set to Allowed not only with core.edit.

Actual result

User/group are not allowed to add article link with core.edit.own permissions (only, core.edit set to Denied).

Additional comments

Problem is in components\com_content\content.php file

current code:

elseif ($input->get('view') === 'articles' && $input->get('layout') === 'modal')
{
    if (!$user->authorise('core.edit', 'com_content'))
    {
        JFactory::getApplication()->enqueueMessage(JText::_('JERROR_ALERTNOAUTHOR'), 'warning');

        return;
    }
} 

changed code to:

elseif ($input->get('view') === 'articles' && $input->get('layout') === 'modal')
{

if (!($user->authorise('core.edit', 'com_content') ||
$user->authorise('core.edit.own', 'com_content')))
    {
        JFactory::getApplication()->enqueueMessage(JText::_('JERROR_ALERTNOAUTHOR'), 'warning');

        return;
    }
}

gives wanted result - users/groups with core.edit.own permission only are allowed to insert links