[LudiusMaximus]

In one of my map addons, I did a work around like this:

-- If you add quest tracker entries, these are tainted until the next /reload.
-- QuestMapFrame_OpenToQuestDetails is called when clicking on a quest tracker entry
-- or when clicking on the ShowMapButton of QuestLogPopupDetailFrame.
-- During combat, QuestMapFrame_OpenToQuestDetails does not manage
-- to bring up WorldMapFrame and hide EncounterJournal and QuestLogPopupDetailFrame.
local OriginalQuestMapFrame_OpenToQuestDetails = QuestMapFrame_OpenToQuestDetails
QuestMapFrame_OpenToQuestDetails = function(...)
 
  if InCombatLockdown() then
    if not WorldMapFrame:IsShown() then
      WorldMapFrame:Show()
    else
      WorldMapFrame:Raise()
    end
  end
 
  OriginalQuestMapFrame_OpenToQuestDetails(...)
end
 
 
 
 
-- QuestLogPopupDetailFrame_Show is called when you right click
-- on a quest tracker entry and select "Open Quest Details".
-- During combat, QuestLogPopupDetailFrame_Show does not manage to
-- bring up QuestLogPopupDetailFrame, so we have to show it manually.
local OriginalQuestLogPopupDetailFrame_Show = QuestLogPopupDetailFrame_Show
QuestLogPopupDetailFrame_Show = function(...)
 
  if InCombatLockdown() then
 
    if not QuestLogPopupDetailFrame:IsShown() then
      QuestLogPopupDetailFrame:Show()
 
    else
      -- If QuestLogPopupDetailFrame is already shown for the clicked quest,
      -- it should be closed, which QuestLogPopupDetailFrame_Show with
      -- its HideUIPanel() also cannot do during combat.
      local questLogIndex = ...
      local questID = C_QuestLog.GetQuestIDForLogIndex(questLogIndex)
      if QuestLogPopupDetailFrame.questID == questID then
        QuestLogPopupDetailFrame:Hide()
        return
      else
        QuestLogPopupDetailFrame:Raise()
      end
    end
  end
 
  OriginalQuestLogPopupDetailFrame_Show(...)
end