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This adds a new typoscript config parameter : allowedParams is a comma separated list of GET params to be transferred to the redirected URL. On top of these configured parameters, config.linkVars, "type" and "MP" params are all allowed. Using allowedParams prevents cache issues with forged/random parameters. If allowedParams is empty, the current behaviour is kept (all GET params are transferred). Behaviour and code is inspired from https://docs.typo3.org/typo3cms/extensions/sr_language_menu/Configuration/TyposcriptConstantsReference/Index.html#allowedparams
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