RTE page browser jumps to external URL on fold / unfolding the pagetree
When you try to unfold or fold the pagetree in the RTE link browser in the page mode the browser will always jump to the external URL tab.
This is a regression from #56470
end of the initialization process to make sure that all required
class variables (like $this->act) are initialized.
Reviewed-by: Tymoteusz Motylewski
Tested-by: Tymoteusz Motylewski
Reviewed-by: Markus Klein
Tested-by: Markus Klein