backport c5f747a

Author: SteffenDE

lib/phoenix_live_view/tag_engine.ex

@@ -1379,7 +1379,7 @@ defmodule Phoenix.LiveView.TagEngine do
   defp decompose_remote_component_tag!(tag_name, tag_meta, state) do
     case String.split(tag_name, ".") |> Enum.reverse() do
       [<<first, _::binary>> = fun_name | rest] when first in ?a..?z ->
-        size = Enum.sum(Enum.map(rest, &byte_size/1)) + length(rest) + 1
+        size = byte_size(tag_name) - byte_size(fun_name) + 1
         aliases = rest |> Enum.reverse() |> Enum.map(&String.to_atom/1)
         fun = String.to_atom(fun_name)
         %{line: line, column: column} = tag_meta