patch 9.0.1874: CI may fail in test_recover_empty_swap

Problem:  CI may fail in test_recover_empty_swap
Solution: Set directory option

Fix failing Test_recover_empty_swap test

:recover by default not only looks in the current directory, but also in
~/tmp for files to recover. If it finds some files to recover, it will
interactively prompt for a file to recover. However, prompting doesn't
work when running the test suite (and even if it would, there is no one
that can answer the prompt).

So it doesn't really make sense during testing, to inspect different
directories for swap files and prompt and wait (which will lead to a
timeout and therefore a failing test).

So set the 'directory' option temporarily to the current directory only
and reset it back once the test finishes.

closes: #13038

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_recover.vim b/src/testdir/test_recover.vim
index 8af1397..a084ef4 100644
--- a/src/testdir/test_recover.vim
+++ b/src/testdir/test_recover.vim
@@ -161,6 +161,7 @@
 func Test_recover_empty_swap_file()
   CheckUnix
   call writefile([], '.Xfile1.swp', 'D')
+  set dir=.
   let msg = execute('recover Xfile1')
   call assert_match('Unable to read block 0 from .Xfile1.swp', msg)
   call assert_equal('Xfile1', @%)
@@ -173,6 +174,7 @@
 
   " :recover from an empty buffer
   call assert_fails('recover', 'E305:')
+  set dir&vim
 endfunc
 
 " Test for :recover using a corrupted swap file
diff --git a/src/version.c b/src/version.c
index 2faa9e6..061e18b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1874,
+/**/
     1873,
 /**/
     1872,