https://git.ruby-lang.org/ruby.git/commit/?id=f36dc2b6de

From f36dc2b6de54ec6b82766d2134a782d12628a2b9 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sat, 12 Sep 2020 01:51:26 +0900
Subject: [ruby/reline] Treat prompt correctly when Reline.prompt_proc isn't
 set

https://github.com/ruby/reline/commit/9c9ba0eff3

diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index edea2fa..9bdccae 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -133,7 +133,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L133
           if @line_index.zero?
             0
           else
-            calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list)
+            calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
           end
         if @prompt_proc
           prompt = prompt_list[@line_index]
@@ -207,10 +207,10 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L207
     @is_multiline = false
   end
 
-  private def calculate_height_by_lines(lines, prompt_list)
+  private def calculate_height_by_lines(lines, prompt)
     result = 0
+    prompt_list = prompt.is_a?(Array) ? prompt : nil
     lines.each_with_index { |line, i|
-      prompt = ''
       prompt = prompt_list[i] if prompt_list and prompt_list[i]
       result += calculate_height_by_width(calculate_width(prompt, true) + calculate_width(line))
     }
@@ -343,7 +343,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L343
         new_lines = whole_lines
       end
       prompt, prompt_width, prompt_list = check_multiline_prompt(new_lines, prompt)
-      all_height = calculate_height_by_lines(new_lines, prompt_list)
+      all_height = calculate_height_by_lines(new_lines, prompt_list || prompt)
       diff = all_height - @highest_in_all
       move_cursor_down(@highest_in_all - @first_line_started_from - @started_from - 1)
       if diff > 0
@@ -383,7 +383,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L383
         if @line_index.zero?
           0
         else
-          calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list)
+          calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
         end
       if @prompt_proc
         prompt = prompt_list[@line_index]
@@ -442,7 +442,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L442
         if @line_index.zero?
           0
         else
-          calculate_height_by_lines(new_buffer[0..(@line_index - 1)], prompt_list)
+          calculate_height_by_lines(new_buffer[0..(@line_index - 1)], prompt_list || prompt)
         end
       @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
       move_cursor_down(@first_line_started_from + @started_from)
diff --git a/test/reline/yamatanooroti/test_rendering.rb b/test/reline/yamatanooroti/test_rendering.rb
index effeb7c..0ab43fa 100644
--- a/test/reline/yamatanooroti/test_rendering.rb
+++ b/test/reline/yamatanooroti/test_rendering.rb
@@ -100,6 +100,22 @@ begin https://github.com/ruby/ruby/blob/trunk/test/reline/yamatanooroti/test_rendering.rb#L100
       EOC
     end
 
+    def test_finish_autowrapped_line_in_the_middle_of_multilines
+      start_terminal(30, 16, %W{ruby -I#{@pwd}/lib #{@pwd}/bin/multiline_repl})
+      sleep 0.5
+      write("<<~EOM\n  ABCDEFG\nEOM\n")
+      close
+      assert_screen(<<~'EOC')
+        Multiline REPL.
+        prompt> <<~EOM
+        prompt>   ABCDEF
+        G
+        prompt> EOM
+        => "ABCDEFG\n"
+        prompt>
+      EOC
+    end
+
     def test_prompt
       File.open(@inputrc_file, 'w') do |f|
         f.write <<~'LINES'
-- 
cgit v0.10.2


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