[ruby/reline] We still need support new and legacy behavior.

Revert "Support for change in Windows-specific behavior at eol"

This reverts commit cad4de6ee841b43f3f0e441626f9415c3eda0f82.

https://github.com/ruby/reline/commit/646587fc2c

lib/reline/line_editor.rb

@@ -725,13 +725,17 @@ class Reline::LineEditor
       Reline::IOGate.move_cursor_column(0)
       if line.nil?
         if calculate_width(visual_lines[index - 1], true) == Reline::IOGate.get_screen_size.last
-          # Reaches the end of line.
-          #
-          # When the cursor is at the end of the line and erases characters
-          # after the cursor, some terminals delete the character at the
-          # cursor position.
-          move_cursor_down(1)
-          Reline::IOGate.move_cursor_column(0)
+          # reaches the end of line
+          if Reline::IOGate.win?
+            # A newline is automatically inserted if a character is rendered at
+            # eol on command prompt.
+          else
+            # When the cursor is at the end of the line and erases characters
+            # after the cursor, some terminals delete the character at the
+            # cursor position.
+            move_cursor_down(1)
+            Reline::IOGate.move_cursor_column(0)
+          end
         else
           Reline::IOGate.erase_after_cursor
           move_cursor_down(1)
@@ -740,6 +744,10 @@ class Reline::LineEditor
         next
       end
       @output.write line
+      if Reline::IOGate.win? and calculate_width(line, true) == Reline::IOGate.get_screen_size.last
+        # A newline is automatically inserted if a character is rendered at eol on command prompt.
+        @rest_height -= 1 if @rest_height > 0
+      end
       @output.flush
       if @first_prompt
         @first_prompt = false