[ruby/reline] Suppress auto indent for adding newlines in pasting

Co-authored-by: Juanito Fatas <me@juanitofatas.com>

https://github.com/ruby/reline/commit/074bb017a7

lib/reline/line_editor.rb

@@ -1339,7 +1339,7 @@ class Reline::LineEditor
       cursor_line = @line.byteslice(0, @byte_pointer)
       insert_new_line(cursor_line, next_line)
       @cursor = 0
-      @check_new_auto_indent = true
+      @check_new_auto_indent = true unless Reline::IOGate.in_pasting?
     end
   end
 

test/reline/yamatanooroti/test_rendering.rb

@@ -663,6 +663,21 @@ begin
       EOC
     end
 
+    def test_suppress_auto_indent_for_adding_newlines_in_pasting
+      start_terminal(5, 30, %W{ruby -I#{@pwd}/lib #{@pwd}/bin/multiline_repl --auto-indent}, startup_message: 'Multiline REPL.')
+      write("<<~Q\n")
+      write("{\n  #\n}")
+      write("#")
+      close
+      assert_screen(<<~EOC)
+        Multiline REPL.
+        prompt> <<~Q
+        prompt> {
+        prompt>   #
+        prompt> }#
+      EOC
+    end
+
     private def write_inputrc(content)
       File.open(@inputrc_file, 'w') do |f|
         f.write content