TYPO3 Core

In TYPO3 8.7.9, it is not possible to set custom values for title and target in the link browser, except for the first iframe (in my case "page").

Reason: After opening the link browser ant then clicking a tab (e.g. "file") the current form values of target & title are sent via _GET.
In both getTitleField() & getTargetField() those values (stored in $this->linkAttributeValues) will override the preconfigured values:

\TYPO3\CMS\RteCKEditor\Controller\BrowseLinksController::getTitleField

if ($this->linkAttributeValues['title']) {
  $title = $this->linkAttributeValues['title'];
} else {
  $title = $this->classesAnchorDefaultTitle[$this->displayedLinkHandlerId] ?: '';
}

\TYPO3\CMS\RteCKEditor\Controller\BrowseLinksController::getTargetField

$target = $this->linkAttributeValues['target'] ?: $this->defaultLinkTarget;

TSconfig:

RTE.classesAnchor {
  internalLink {
    class = anchor anchor--internal
    type = page
    titleText = Title for internalLink
  }

  downloadLink {
    class = anchor anchor--download
    type = file
    target = _blank
    titleText = Title for downloadLink
  }

  externalLink {
    class = anchor anchor--external
    type = url
    target = _blank
    titleText = Title for externalLink
  }

  externalDownloadLink {
    class = anchor anchor--download
    type = url
    target = _blank
    titleText = Title for externalDownloadLink
  }

  mailLink {
    class = anchor anchor--mail
    type = mail
    titleText = Title for mailLink
  }
}