[ruby/reline] Remove unnecessary variables, lower_space

The number of lines below the cursor position was known by
"@rest_height" alone, but the problem was caused by adding
"lower_space". Remove "lower_space" as it is unnecessary.

https://github.com/ruby/reline/commit/a575cef6a3

1 files changed, 2 insertions, 3 deletions

diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index 50bd22b424..39e2b427bc 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -706,19 +706,18 @@ class Reline::LineEditor
       dialog.scrollbar_pos = nil
     end
     upper_space = @first_line_started_from - @started_from
-    lower_space = @highest_in_all - @first_line_started_from - @started_from - 1
     dialog.column = dialog_render_info.pos.x
     dialog.width += @block_elem_width if dialog.scrollbar_pos
     diff = (dialog.column + dialog.width) - (@screen_size.last)
     if diff > 0
       dialog.column -= diff
     end
-    if (lower_space + @rest_height - dialog_render_info.pos.y) >= height
+    if (@rest_height - dialog_render_info.pos.y) >= height
       dialog.vertical_offset = dialog_render_info.pos.y + 1
     elsif upper_space >= height
       dialog.vertical_offset = dialog_render_info.pos.y - height
     else
-      if (lower_space + @rest_height - dialog_render_info.pos.y) < height
+      if (@rest_height - dialog_render_info.pos.y) < height
         scroll_down(height + dialog_render_info.pos.y)
         move_cursor_up(height + dialog_render_info.pos.y)
       end