patch 8.2.0568: the man filetype plugin overwrites the unnamed register
Problem: The man filetype plugin overwrites the unnamed register.
Solution: Use the black hole register. (Jason Franklin)
diff --git a/src/testdir/test_man.vim b/src/testdir/test_man.vim
index 9de8cb4..083b1ae 100644
--- a/src/testdir/test_man.vim
+++ b/src/testdir/test_man.vim
@@ -1,3 +1,5 @@
+" Test specifically for the Man filetype plugin.
+
runtime ftplugin/man.vim
func Test_g_ft_man_open_mode()
@@ -111,3 +113,21 @@
%bw!
set foldcolumn& number&
endfunc
+
+" Check that the unnamed register is not overwritten.
+func Test_keep_unnamed_register()
+ %bw!
+
+ let @" = '---'
+
+ let wincnt = winnr('$')
+ Man vim
+ if wincnt == winnr('$')
+ " Vim manual page cannot be found.
+ return
+ endif
+
+ call assert_equal('---', @")
+
+ %bw!
+endfunc