TYPO3: RealURL Language Switch for Extbase Extension - typo3

Question

I have set up a single-domain website with different languages and configured RealURL.
On one page, there is a FE plugin with list and show actions. The links from the list to the show action are rendered correctly, for example:
en/press.html -> en/press/release1.html
en/press.html -> en/press/release2.html
Clicking on one of the links surfaces the detail page - so far, so good. Everything works as expected.
However, the language switch returns the following links (on the detail page):
en/press.html
de/presse.html
The links, of course, should read as follows:
en/press/release1.html
de/presse/aussendung1.html
Also, the breadcrumb menu does not show the detail page; it reads Home > Press, regardless of whether I'm on the list or show action.
Language Nav
temp.langNav = COA
temp.langNav {
10 = HMENU
10 {
special = language
special.value = 0,1,2,3,4,5,6,7,8
special.normalWhenNoLanguage = 0
wrap = <ul class="lang-sel__list">|</ul>
1 = TMENU
1 {
noBlur = 1
NO = 1
NO {
allWrap = <li class="lang-sel__item">|</li>
ATagParams = class="lang-sel__link"
stdWrap.setCurrent = English || Deutsch || Русский || Česky || Polski || Français || Română || Hrvatski || Slovenčina
stdWrap.current = 1
}
USERDEF1 = 1
USERDEF1 {
doNotLinkIt = 1
stdWrap.cObject = TEXT
stdWrap.cObject.value =
}
}
}
}
temp.selectedLang = TEXT
temp.selectedLang.value < config.language
Breadcrumb Nav
temp.breadcrumbNav=COA
temp.breadcrumbNav {
10 = HMENU
10 {
special = rootline
special.range = 0|-1
includeNotInMenu = 1
wrap = |
1 = TMENU
1.noBlur = 1
1.CUR = 1
1.wrap = |
1.NO {
stdWrap.field = title
ATagParams = class="main-header__breadcrumb-link"
ATagTitle.field = nav_title // title
linkWrap = <li class="main-header__breadcrumb-item">|</li>
}
1.CUR {
stdWrap.field = title
linkWrap = <li class="main-header__breadcrumb-item">|</li>
doNotLinkIt = 1
}
}
}
RealURL Config
$TYPO3_CONF_VARS['FE']['addRootLineFields'].= ',tx_realurl_pathsegment';
$TYPO3_CONF_VARS['EXTCONF']['realurl'] = array(
'_DEFAULT' => array(
'init' => array(
'enableCHashCache' => 1,
'appendMissingSlash' => 'ifNotFile',
'enableUrlDecodeCache' => 1,
'enableUrlEncodeCache' => 1,
'postVarSet_failureMode' => '',
),
'redirects' => array(),
'preVars' => array(
array(
'GETvar' => 'L',
'valueMap' => array(
'en' => 0,
'de' => 1,
'ru' => 2,
'cz' => 3,
'pl' => 4,
'fr' => 5,
'ro' => 6,
'hr' => 7,
'sk' => 8
),
'valueDefault' => 'en',
),
),
'pagePath' => array(
'type' => 'user',
'userFunc' => 'EXT:realurl/class.tx_realurl_advanced.php:&tx_realurl_advanced->main',
'spaceCharacter' => '-',
'languageGetVar' => 'L',
'expireDays' => 7,
'rootpage_id' => 1,
'firstHitPathCache' => 1,
),
'fixedPostVars' => array(
'_DEFAULT' => array(
array(
'GETvar' => 'press',
'lookUpTable' => array(
'table' => 'tx_myext_domain_model_press',
'id_field' => 'uid',
'alias_field' => 'title',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => 1,
'useUniqueCache_conf' => array(
'strtolower' => 1,
'spaceCharacter' => '-'
),
'languageGetVar' => 'L',
'languageField' => 'sys_language_uid',
'transOrigPointerField' => 'l10n_parent',
)
)
),
'fileName' => array(
'defaultToHTMLsuffixOnPrev' => 1
),
),
);

Answer 1

You need to tell TYPO3 to keep the parameters.
This is done by configuring addQueryString in the HMENU ConentObject.
Your example would be extended by:
temp.breadcrumbNav=COA
temp.breadcrumbNav {
10 = HMENU
10 {
1 {
NO {
addQueryString.exclude = L,cHash
}
}
}
}
For further information check the documentation:
docs.typo3.org/typo3cms/TyposcriptReference/ContentObjects/Hmenu/Index.html and docs.typo3.org/typo3cms/TyposcriptReference/Functions/Typolink/Index.html
And the solution above can be found on forge: https://forge.typo3.org/issues/16466#note-3