From a39f78f5e599ef29cc15c46c352ec5560e0f8e73 Mon Sep 17 00:00:00 2001
From: Shougo Matsushita <Shougo.Matsu@gmail.com>
Date: Fri, 20 Nov 2020 19:12:46 +0900
Subject: Fix #1149 add refresh_backspace option

---
 autoload/deoplete/handler.vim | 23 ++++++++++++++---------
 autoload/deoplete/init.vim    |  2 +-
 doc/deoplete.txt              |  7 +++++++
 3 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/autoload/deoplete/handler.vim b/autoload/deoplete/handler.vim
index bf98ce5..8ff2023 100644
--- a/autoload/deoplete/handler.vim
+++ b/autoload/deoplete/handler.vim
@@ -186,8 +186,20 @@ endfunction
 function! deoplete#handler#_completion_begin(event) abort
   call deoplete#custom#_update_cache()
 
-  if s:is_skip(a:event)
+  let auto_popup = deoplete#custom#_get_option(
+        \ 'auto_complete_popup') !=# 'manual'
+  let prev_input = get(g:deoplete#_context, 'input', '')
+  let cur_input = deoplete#util#get_input(a:event)
+
+  let check_back_space = auto_popup
+        \ && cur_input !=# prev_input
+        \ && len(cur_input) + 1 ==# len(prev_input)
+        \ && stridx(prev_input, cur_input) == 0
+  let refresh_backspace = deoplete#custom#_get_option('refresh_backspace')
+
+  if s:is_skip(a:event) || (check_back_space && !refresh_backspace)
     let g:deoplete#_context.candidates = []
+    let g:deoplete#_context.input = cur_input
     return
   endif
 
@@ -201,14 +213,7 @@ function! deoplete#handler#_completion_begin(event) abort
         \ 'deoplete_auto_completion_begin', {'event': a:event})
 
   " For <BS> popup flicker
-  let auto_popup = deoplete#custom#_get_option(
-        \ 'auto_complete_popup') !=# 'manual'
-  let prev_input = get(g:deoplete#_context, 'input', '')
-  let cur_input = deoplete#util#get_input(a:event)
-  if auto_popup && empty(v:completed_item)
-        \ && cur_input !=# prev_input
-        \ && len(cur_input) + 1 ==# len(prev_input)
-        \ && stridx(prev_input, cur_input) == 0
+  if check_back_space && empty(v:completed_item)
     call feedkeys("\<Plug>_", 'i')
   endif
 endfunction
diff --git a/autoload/deoplete/init.vim b/autoload/deoplete/init.vim
index e181e81..e848392 100644
--- a/autoload/deoplete/init.vim
+++ b/autoload/deoplete/init.vim
@@ -236,7 +236,6 @@ function! s:check_custom_option(old_var, new_var) abort
 endfunction
 
 function! deoplete#init#_option() abort
-  " Note: HTML omni func use search().
   return {
         \ 'auto_complete': v:true,
         \ 'auto_complete_delay': 0,
@@ -259,6 +258,7 @@ function! deoplete#init#_option() abort
         \ 'prev_completion_mode': '',
         \ 'profile': v:false,
         \ 'refresh_always': v:true,
+        \ 'refresh_backspace': v:true,
         \ 'skip_chars': ['(', ')'],
         \ 'skip_multibyte': v:false,
         \ 'smart_case': &smartcase,
diff --git a/doc/deoplete.txt b/doc/deoplete.txt
index a42c854..573da68 100644
--- a/doc/deoplete.txt
+++ b/doc/deoplete.txt
@@ -302,6 +302,13 @@ refresh_always
 		Note: It increases the screen flicker when
 		|deoplete-options-num_processes| != 0.
 
+		Default value: v:true
+
+					*deoplete-options-refresh_backspace*
+refresh_backspace
+		Deoplete refreshes the candidates automatically when you
+		press <BS> or <C-h> key.
+
 		Default value: v:true
 
 					*deoplete-options-skip_multibyte*
-- 
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