[ruby/reline] Clear dialog when adding new line to end of buffer

https://github.com/ruby/reline/commit/7d38454327

lib/reline/line_editor.rb

@@ -466,6 +466,11 @@ class Reline::LineEditor
     new_highest_in_this = calculate_height_by_width(prompt_width + calculate_width(@line.nil? ? '' : @line))
     rendered = false
     if @add_newline_to_end_of_buffer
+      @dialogs.each do |dialog|
+        clear_each_dialog(dialog)
+        dialog.contents = nil
+        dialog.trap_key = nil
+      end
       rerender_added_newline(prompt, prompt_width)
       @add_newline_to_end_of_buffer = false
     else

test/reline/yamatanooroti/test_rendering.rb

@@ -1271,6 +1271,23 @@ begin
       EOC
     end
 
+    def test_clear_dialog_when_adding_new_line_to_end_of_buffer
+      start_terminal(10, 30, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --autocomplete}, startup_message: 'Multiline REPL.')
+      write("class A\n  def a\n    3\n  end\nend")
+      write("\n")
+      write("class S")
+      write("\n")
+      write("  3")
+      close
+      assert_screen(<<~'EOC')
+        prompt>   end
+        prompt> end
+        => :a
+        prompt> class S
+        prompt>   3
+      EOC
+    end
+
     def write_inputrc(content)
       File.open(@inputrc_file, 'w') do |f|
         f.write content