tests: stablize test-rename-merge1.t on Windows
This goes with d7622fdec3b5.
Differential Revision: https://phab.mercurial-scm.org/D8036
--- a/tests/test-rename-merge1.t Sat Sep 21 17:27:14 2019 +0900
+++ b/tests/test-rename-merge1.t Tue Jan 28 22:03:00 2020 -0500
@@ -213,6 +213,7 @@
ancestor: 5151c134577e, local: 07fcbc9a74ed+, remote: f21419739508
preserving x for resolve of x
preserving z for resolve of z
+ starting 4 threads for background file closing (?)
x: prompt changed/deleted -> m (premerge)
picked tool ':prompt' for x (binary False symlink False changedelete True)
file 'x' was deleted in other [merge rev] but was modified in local [working copy].