from retail diffcheck complete

WeakAurasOptions/OptionsFrames/FrameChooser.lua

@@ -1,5 +1,8 @@
 if not WeakAuras.IsLibsOK() then return end
-local AddonName, OptionsPrivate = ...
+---@type string
+local AddonName = ...
+---@class OptionsPrivate
+local OptionsPrivate = select(2, ...)
 
 -- Lua APIs
 local pairs = pairs
@@ -8,6 +11,7 @@ local pairs = pairs
 local CreateFrame, IsMouseButtonDown, SetCursor, GetMouseFocus, MouseIsOver, ResetCursor
 = CreateFrame, IsMouseButtonDown, SetCursor, GetMouseFocus, MouseIsOver, ResetCursor
 
+---@class WeakAuras
 local WeakAuras = WeakAuras
 local L = WeakAuras.L
 
@@ -37,7 +41,7 @@ function OptionsPrivate.StartFrameChooser(data, path)
   local frame = OptionsPrivate.Private.OptionsFrame();
   if not(frameChooserFrame) then
     frameChooserFrame = CreateFrame("Frame");
-    frameChooserBox = CreateFrame("Frame", nil, frameChooserFrame);
+    frameChooserBox = CreateFrame("Frame", nil, frameChooserFrame, "BackdropTemplate");
     frameChooserBox:SetFrameStrata("TOOLTIP");
     frameChooserBox:SetBackdrop({
       edgeFile = "Interface\\Tooltips\\UI-Tooltip-Border",
@@ -59,7 +63,13 @@ function OptionsPrivate.StartFrameChooser(data, path)
     else
       SetCursor("CAST_CURSOR");
 
-      local focus = GetMouseFocus();
+      local focus
+      if GetMouseFocus then
+        focus = GetMouseFocus()
+      elseif GetMouseFoci then
+        local foci = GetMouseFoci()
+        focus = foci[1] or nil
+      end
       local focusName;
 
       if(focus) then