patch 8.2.2490: 'wrap' option is always reset when starting diff mode
Problem: 'wrap' option is always reset when starting diff mode.
Solution: Add the "followwrap" item in 'diffopt'. (Rick Howe, closes #7797)
diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index 2d6228a..d09d741 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
@@ -1045,6 +1045,21 @@
enew!
endfunc
+func Test_diff_followwrap()
+ new
+ set diffopt+=followwrap
+ set wrap
+ diffthis
+ call assert_equal(1, &wrap)
+ diffoff
+ set nowrap
+ diffthis
+ call assert_equal(0, &wrap)
+ diffoff
+ set diffopt&
+ bwipe!
+endfunc
+
func Test_diff_maintains_change_mark()
enew!
call setline(1, ['a', 'b', 'c', 'd'])