patch 8.2.2496: insufficien testing for text jumping fix

Problem:    Insufficien testing for text jumping fix.
Solution:   Add another test case.

src/testdir/test_breakindent.vim

@@ -634,15 +634,20 @@ func Test_breakindent19_sbr_nextpage()
   call s:compare_lines(expect, lines)
   " Scroll down one screen line
   setl scrolloff=5
-  norm! 6gj
+  norm! 5gj
-  redraw!
   let lines = s:screen_lines(1, 20)
   let expect = [
-	\ "> aaaaaaaaaaaaaaaaaa",
+	\ "aaaaaaaaaaaaaaaaaaaa",
 	\ "> aaaaaaaaaaaaaaaaaa",
 	\ "> aaaaaaaaaaaaaaaaaa",
 	\ ]
   call s:compare_lines(expect, lines)
+  redraw!
+  " moving the cursor doesn't change the text offset
+  norm! l
+  redraw!
+  let lines = s:screen_lines(1, 20)
+  call s:compare_lines(expect, lines)
 
   setl breakindent briopt=min:18 sbr=>
   norm! 5gj

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2496,
 /**/
     2495,
 /**/