diff -ur grub-2.04.orig/util/grub-mkconfig_lib.in grub-2.04/util/grub-mkconfig_lib.in
--- grub-2.04.orig/util/grub-mkconfig_lib.in	2019-08-18 15:42:13.463000000 +0200
+++ grub-2.04/util/grub-mkconfig_lib.in	2019-08-18 15:42:40.188000000 +0200
@@ -187,6 +187,7 @@
     case "$1" in
       *.dpkg-*) return 1 ;; # debian dpkg
       *.rpmsave|*.rpmnew) return 1 ;;
+      *.bak|*~|.*.swp) return 1 ;;    # backup and swap files from editors
       README*|*/README*)  return 1 ;; # documentation
       *.sig) return 1 ;; # signatures
     esac