[ruby/reline] Autowrap correctly when inserting chars in the middle of a line

https://github.com/ruby/reline/commit/ebaf37255f

lib/reline/line_editor.rb

@@ -704,8 +704,8 @@ class Reline::LineEditor
         @highest_in_this = height
       end
       move_cursor_up(@started_from)
-      cursor_up_from_last_line = height - 1 - @started_from
       @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
+      cursor_up_from_last_line = height - 1 - @started_from
     end
     if Reline::Unicode::CSI_REGEXP.match?(prompt + line_to_render)
       @output.write "\e[0m" # clear character decorations

test/reline/yamatanooroti/test_rendering.rb

@@ -678,6 +678,20 @@ begin
       EOC
     end
 
+    def test_autowrap_in_the_middle_of_a_line
+      start_terminal(5, 20, %W{ruby -I#{@pwd}/lib #{@pwd}/bin/multiline_repl}, startup_message: 'Multiline REPL.')
+      write("def abcdefg; end\C-b\C-b\C-b\C-b\C-b")
+      %w{h i}.each do |c|
+        write(c)
+      end
+      close
+      assert_screen(<<~EOC)
+        Multiline REPL.
+        prompt> def abcdefgh
+        i; end
+      EOC
+    end
+
     private def write_inputrc(content)
       File.open(@inputrc_file, 'w') do |f|
         f.write content