[zork]

Here is what I do for now:

if cfg.units.raid.show then
 
    --register style
    oUF:RegisterStyle("diablo:raid", createStyle)
    oUF:SetActiveStyle("diablo:raid")
 
    local attr = cfg.units.raid.attributes
 
    local raidDragFrame = CreateFrame("Frame", "oUF_DiabloRaidDragFrame", UIParent)
    raidDragFrame:SetSize(50,50)
    raidDragFrame:SetPoint(cfg.units.raid.pos.a1,cfg.units.raid.pos.af,cfg.units.raid.pos.a2,cfg.units.raid.pos.x,cfg.units.raid.pos.y)
    func.applyDragFunctionality(raidDragFrame)
    table.insert(oUF_Diablo_Units,"oUF_DiabloRaidDragFrame") --add frames to the slash command function
 
    local groups, group = {}, nil
   
    for i=1, NUM_RAID_GROUPS do
      local name = "oUF_DiabloRaidGroup"..i
      group = oUF:SpawnHeader(
        name,
        nil,
        attr.visibility,
        "showPlayer",         attr.showPlayer,
        "showSolo",           attr.showSolo,
        "showParty",          attr.showParty,
        "showRaid",           attr.showRaid,
        "point",              attr.point,
        "yOffset",            attr.yOffset,
        "xoffset",            attr.xoffset,
        "groupFilter",        tostring(i),
        "unitsPerColumn",     5,
        --"unitsPerColumn",     attr.unitsPerColumn,
        --"columnSpacing",      attr.columnSpacing,
        --"columnAnchorPoint",  attr.columnAnchorPoint,
        "oUF-initialConfigFunction", ([[
          self:SetWidth(%d)
          self:SetHeight(%d)
        ]]):format(128, 64)
      )
      if i == 1 then
        group:SetPoint("TOPLEFT",raidDragFrame,0,0)
      else
        if attr.columnAnchorPoint == "TOP" then
          group:SetPoint("TOPLEFT", groups[i-1], "BOTTOMLEFT", 0, attr.columnSpacing)
        elseif attr.columnAnchorPoint == "BOTTOM" then
          group:SetPoint("BOTTOMLEFT", groups[i-1], "TOPLEFT", 0, attr.columnSpacing)
        elseif attr.columnAnchorPoint == "LEFT" then
          group:SetPoint("TOPLEFT", groups[i-1], "TOPRIGHT", attr.columnSpacing, 0)
        else
          group:SetPoint("TOPRIGHT", groups[i-1], "TOPLEFT", attr.columnSpacing, 0)
        end
      end
      groups[i] = group
    end
 
    local updateRaidScale = CreateFrame("Frame")
    updateRaidScale:RegisterEvent("GROUP_ROSTER_UPDATE")
    updateRaidScale:RegisterEvent("PLAYER_ENTERING_WORLD")
    updateRaidScale:SetScript("OnEvent", function(self)
      if(InCombatLockdown()) then
        self:RegisterEvent("PLAYER_REGEN_ENABLED")
      else
        self:UnregisterEvent("PLAYER_REGEN_ENABLED")
        local num = GetNumGroupMembers()
        local scale = (100-num)/100*cfg.units.raid.scale
        for idx, group in pairs(groups) do
          if group then
            group:SetScale(scale)
          end
        end
      end
    end)    
   
  end

So I check for out of combat and do my adjustments if needed.