patch 8.2.0146: wrong indent when 'showbreak' and 'breakindent' are set

Problem:    Wrong indent when 'showbreak' and 'breakindent' are set and
            'briopt' includes "sbr".
Solution:   Reset "need_showbreak" where needed. (Ken Takata, closes #5523)
diff --git a/src/testdir/test_breakindent.vim b/src/testdir/test_breakindent.vim
index ee61cbc..f7cfb4e 100644
--- a/src/testdir/test_breakindent.vim
+++ b/src/testdir/test_breakindent.vim
@@ -658,3 +658,29 @@
   call s:close_windows('set breakindent& list& listchars&')
 endfunc
 
+func Test_breakindent19_sbr_nextpage()
+  let s:input = ""
+  call s:test_windows('setl breakindent briopt=shift:2,sbr,min:18 sbr=>')
+  call setline(1, repeat('a', 200))
+  norm! 1gg
+  redraw!
+  let lines = s:screen_lines(1, 20)
+  let expect = [
+	\ "aaaaaaaaaaaaaaaaaaaa",
+	\ "> aaaaaaaaaaaaaaaaaa",
+	\ "> aaaaaaaaaaaaaaaaaa",
+	\ ]
+  call s:compare_lines(expect, lines)
+  " Scroll down one screen line
+  setl scrolloff=5
+  norm! 5gj
+  redraw!
+  let lines = s:screen_lines(1, 20)
+  let expect = [
+	\ "> aaaaaaaaaaaaaaaaaa",
+	\ "> aaaaaaaaaaaaaaaaaa",
+	\ "> aaaaaaaaaaaaaaaaaa",
+	\ ]
+  call s:compare_lines(expect, lines)
+  call s:close_windows('set breakindent& briopt& sbr&')
+endfunc