patch 8.2.0308: 'showbreak' does not work for a very long line

Problem:    'showbreak' does not work for a very long line. (John Little)
Solution:   Check whether 'briopt' contains "sbr". (Ken Takata, closes #5523,
            closes #5684)
diff --git a/src/drawline.c b/src/drawline.c
index 176aa69..b581411 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -1176,7 +1176,7 @@
 		    c_final = NUL;
 		    n_extra = get_breakindent_win(wp,
 				       ml_get_buf(wp->w_buffer, lnum, FALSE));
-		    if (wp->w_skipcol > 0 && wp->w_p_wrap)
+		    if (wp->w_skipcol > 0 && wp->w_p_wrap && wp->w_p_brisbr)
 			need_showbreak = FALSE;
 		    // Correct end of highlighted area for 'breakindent',
 		    // required when 'linebreak' is also set.