patch 8.2.2489: current buffer is wrong after deletebufline() fails
Problem: current buffer is wrong after deletebufline() fails to delete a
line in another buffer.
Solution: Restore the current buffer.
diff --git a/src/testdir/test_bufline.vim b/src/testdir/test_bufline.vim
index 5df5288..04653ba 100644
--- a/src/testdir/test_bufline.vim
+++ b/src/testdir/test_bufline.vim
@@ -186,6 +186,17 @@
call assert_equal(0, deletebufline(b, 1))
call assert_equal(['b', 'c'], getbufline(b, 1, 2))
exe "bwipe! " . b
+
+ edit XbufOne
+ let one = bufnr()
+ call setline(1, ['a', 'b', 'c'])
+ setlocal nomodifiable
+ split XbufTwo
+ let two = bufnr()
+ call assert_fails('call deletebufline(one, 1)', 'E21:')
+ call assert_equal(two, bufnr())
+ bwipe! XbufTwo
+ bwipe! XbufOne
endfunc
func Test_appendbufline_redraw()