from retail

WeakAuras/RegionTypes/AuraBar.lua

@@ -1020,7 +1020,7 @@ local funcs = {
     end
 
     iconPath = iconPath or self.displayIcon or "Interface\\Icons\\INV_Misc_QuestionMark"
-    self.icon:SetTexture(iconPath)
+    Private.SetTextureOrSpellTexture(self.icon, iconPath)
   end,
   SetOverlayColor = function(self, id, r, g, b, a)
     self.bar:SetAdditionalBarColor(id, { r, g, b, a});

WeakAuras/RegionTypes/Icon.lua

@@ -557,7 +557,7 @@ local function modify(parent, region, data)
     end
 
     iconPath = iconPath or self.displayIcon or "Interface\\Icons\\INV_Misc_QuestionMark"
-    icon:SetTexture(iconPath)
+    Private.SetTextureOrSpellTexture(icon, iconPath)
   end
 
   function region:Scale(scalex, scaley)

WeakAuras/RegionTypes/RegionPrototype.lua

@@ -1151,6 +1151,15 @@ function Private.regionPrototype.AddExpandFunction(data, region, cloneId, parent
   end
 end
 
+function Private.SetTextureOrSpellTexture(texture, path)
+  local spellID = tonumber(path)
+  if spellID then
+    return texture:SetTexture(select(3, GetSpellInfo(spellID)) or spellID)
+  else
+    return texture:SetTexture(path)
+  end
+end
+
 do
   local function move_condition_subregions(data, offset, afterPos)
     if data.conditions then