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Added an example about how to get the impersonating user object

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Original file line number	Diff line number	Diff line change
`@@ -86,6 +86,23 @@ to show a link to exit impersonation:`
`86`	`86`	`</a>`
`87`	`87`	`<?php endif ?>`
`88`	`88`
	`89`	`+In some cases you may need to get the object that represents the impersonating`
	`90`	`+user rather than the impersonated user. Use the following snippet to iterate`
	`91`	+over user's roles until you get the ``SwitchUserRole`` related to the
	`92`	`+impersonating user::`
	`93`	`+`
	`94`	`+ use Symfony\Component\Security\Core\Role\SwitchUserRole;`
	`95`	`+`
	`96`	`+ $securityContext = $this->get('security.context');`
	`97`	`+`
	`98`	`+ if ($securityContext->isGranted('ROLE_PREVIOUS_ADMIN')) {`
	`99`	`+ foreach ($securityContext->getToken()->getRoles() as $role) {`
	`100`	`+ if ($role instanceof SwitchUserRole) {`
	`101`	`+ $impersonatingUser = $role->getSource()->getUser();`
	`102`	`+ }`
	`103`	`+ }`
	`104`	`+ }`
	`105`	`+`
`89`	`106`	`Of course, this feature needs to be made available to a small group of users.`
`90`	`107`	By default, access is restricted to users having the ``ROLE_ALLOWED_TO_SWITCH``
`91`	`108`	role. The name of this role can be modified via the ``role`` setting. For

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