correctly format specs when there are more than one

previous version would remove @SPEC from everything but the first one
Fixes #959

Author: lukaszsamson

apps/language_server/lib/language_server/source_file.ex

@@ -216,9 +216,6 @@ defmodule ElixirLS.LanguageServer.SourceFile do
         {:ok, code} ->
           code
           |> to_string()
-          |> lines()
-          |> remove_indentation(String.length("@spec "))
-          |> Enum.join("\n")
 
         {:error, _} ->
           spec
@@ -267,12 +264,6 @@ defmodule ElixirLS.LanguageServer.SourceFile do
     end
   end
 
-  defp remove_indentation([line | rest], length) do
-    [line | Enum.map(rest, &String.slice(&1, length..-1))]
-  end
-
-  defp remove_indentation(lines, _), do: lines
-
   def lsp_character_to_elixir(_utf8_line, lsp_character) when lsp_character <= 0, do: 1
 
   def lsp_character_to_elixir(utf8_line, lsp_character) do

apps/language_server/test/providers/completion_test.exs

@@ -1111,9 +1111,9 @@ defmodule ElixirLS.LanguageServer.Providers.CompletionTest do
                The summary
                ```
                @spec add(
-                 a_big_name :: integer,
-                 b_big_name :: integer
-               ) :: integer
+                       a_big_name :: integer,
+                       b_big_name :: integer
+                     ) :: integer
                ```
                """
              }

apps/language_server/test/server_test.exs

@@ -1015,8 +1015,8 @@ defmodule ElixirLS.LanguageServer.ServerTest do
 
                    ```
                    @spec inspect(device, item, keyword) ::
-                     item
-                   when item: var
+                           item
+                         when item: var
                    ```
                    """
                  },

apps/language_server/test/source_file_test.exs

@@ -30,9 +30,9 @@ defmodule ElixirLS.LanguageServer.SourceFileTest do
 
            ```
            @spec format_spec(
-             String.t(),
-             keyword()
-           ) :: String.t()
+                   String.t(),
+                   keyword()
+                 ) :: String.t()
            ```
            """
   end