Do not full deepcopy vital-over object

autoload/incsearch.vim

@@ -481,24 +481,16 @@ function! s:inc.on_char(cmdline) abort
 endfunction
 
 call s:cli.connect(s:inc)
-"}}}
-
-" Main: {{{
 
-" @return vital-over command-line interface object. it's experimental!!!
-function! incsearch#cli() abort
-  try
-    " It returns current cli object
-    return s:Doautocmd.get_cmdline()
-  catch /vital-over(_incsearch) Exception/
-    " If there are no current cli object, return default one
-    return s:cli
-  endtry
+"" partial deepcopy() for cli.connect(module) instead of copy()
+function! s:copy_cli(cli) abort
+  let cli = copy(a:cli)
+  let cli.variables = deepcopy(a:cli.variables)
+  return cli
 endfunction
 
 function! s:make_cli(config) abort
-  " deepcopy() for cli.connect(module) instead of copy()
-  let cli = deepcopy(s:cli)
+  let cli = s:copy_cli(s:cli)
   let cli._base_key = a:config.command
   let cli._vcount1 = a:config.count1
   let cli._is_expr = a:config.is_expr
@@ -511,6 +503,21 @@ function! s:make_cli(config) abort
   return cli
 endfunction
 
+"}}}
+
+" Main: {{{
+
+" @return vital-over command-line interface object. it's experimental!!!
+function! incsearch#cli() abort
+  try
+    " It returns current cli object
+    return s:Doautocmd.get_cmdline()
+  catch /vital-over(_incsearch) Exception/
+    " If there are no current cli object, return default one
+    return s:cli
+  endtry
+endfunction
+
 " @api
 function! incsearch#go(...) abort
   let config = incsearch#config#make(get(a:, 1, {}))