patch 8.2.1936: session sets the local 'scrolloff' value to the global value

Problem:    Session sets the local 'scrolloff' value to the global value.
Solution:   Do not let restoring the global option value change the local
            value.

src/session.c

@@ -1216,7 +1216,7 @@ ex_mkrc(exarg_T	*eap)
 #ifdef FEAT_SESSION
 	if (!failed && view_session)
 	{
-	    if (put_line(fd, "let s:so_save = &so | let s:siso_save = &siso | set so=0 siso=0") == FAIL)
+	    if (put_line(fd, "let s:so_save = &g:so | let s:siso_save = &g:siso | setg so=0 siso=0 | setl so=-1 siso=-1") == FAIL)
 		failed = TRUE;
 	    if (eap->cmdidx == CMD_mksession)
 	    {
@@ -1261,7 +1261,7 @@ ex_mkrc(exarg_T	*eap)
 		failed |= (put_view(fd, curwin, !using_vdir, flagp, -1, NULL)
 								      == FAIL);
 	    }
-	    if (put_line(fd, "let &so = s:so_save | let &siso = s:siso_save")
+	    if (put_line(fd, "let &g:so = s:so_save | let &g:siso = s:siso_save")
 								      == FAIL)
 		failed = TRUE;
 #ifdef FEAT_SEARCH_EXTRA

src/testdir/test_mksession.vim

@@ -859,4 +859,17 @@ func Test_mkvimrc()
   call delete('Xtestvimrc')
 endfunc
 
+func Test_scrolloff()
+  set sessionoptions+=localoptions
+  setlocal so=1 siso=1
+  mksession! Xtest_mks.out
+  setlocal so=-1 siso=-1
+  source Xtest_mks.out
+  call assert_equal(1, &l:so)
+  call assert_equal(1, &l:siso)
+  call delete('Xtest_mks.out')
+  setlocal so& siso&
+  set sessionoptions&
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1936,
 /**/
     1935,
 /**/