[ruby/reline] Use cached prompt list when just moved the cursor

https://github.com/ruby/reline/commit/cfe619460b

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index f33b22852d..3637941209 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -80,7 +80,15 @@ class Reline::LineEditor
     end
     return [prompt, calculate_width(prompt, true), [prompt] * buffer.size] if simplified_rendering?
     if @prompt_proc
-      if @cached_prompt_list and Time.now.to_f < (@prompt_cache_time + PROMPT_LIST_CACHE_TIMEOUT) and buffer.size == @cached_prompt_list.size
+      use_cached_prompt_list = false
+      if @cached_prompt_list
+        if @just_cursor_moving
+          use_cached_prompt_list = true
+        elsif Time.now.to_f < (@prompt_cache_time + PROMPT_LIST_CACHE_TIMEOUT) and buffer.size == @cached_prompt_list.size
+          use_cached_prompt_list = true
+        end
+      end
+      if use_cached_prompt_list
         prompt_list = @cached_prompt_list
       else
         prompt_list = @cached_prompt_list = @prompt_proc.(buffer)