Let off-screen matching work at screen edge, closes #28

autoload/matchup.vim

@@ -21,6 +21,7 @@ function! s:init_options()
   call s:init_option('matchup_matchparen_enabled',
     \ !(&t_Co < 8 && !has('gui_running')))
   call s:init_option('matchup_matchparen_status_offscreen', 1)
+  call s:init_option('matchup_matchparen_scrolloff', 0)
   call s:init_option('matchup_matchparen_singleton', 0)
   call s:init_option('matchup_matchparen_deferred', 0)
   call s:init_option('matchup_matchparen_deferred_show_delay', 50)

autoload/matchup/matchparen.vim

@@ -299,13 +299,14 @@ function! s:matchparen.highlight(...) abort dict " {{{1
   let w:matchup_need_clear = 1
 
   " disable off-screen when scrolling with j/k
-  let l:scrolling = winheight(0) > 2*&scrolloff
+  let l:scrolling = g:matchup_matchparen_scrolloff
+        \ && winheight(0) > 2*&scrolloff
         \ && (line('.') == line('w$')-&scrolloff
         \     || line('.') == line('w0')+&scrolloff)
 
   " show off-screen matches
-  if g:matchup_matchparen_status_offscreen && !l:current.skip
-        \ && (!l:scrolling || g:matchup_matchparen_deferred)
+  if g:matchup_matchparen_status_offscreen
+        \ && !l:current.skip && !l:scrolling
     call matchup#matchparen#offscreen(l:current)
   endif
 

doc/matchup.txt

@@ -538,6 +538,14 @@ Module matchparen~
 
   Default: 1
 
+*g:matchup_matchparen_scrolloff*
+
+  When enabled, off-screen matches will not be shown in the statusline
+  while the cursor is at the screen edge (respects the value of 'scrolloff').
+  This is intended to prevent flickering while scrolling with j and k.
+
+  Default: 0
+
 *g:matchup_matchparen_stopline*
 
   The number of lines to search in either direction while highlighting