Update runtime files.

runtime/indent/testdir/yaml.in

@@ -0,0 +1,14 @@
+# vim: set ft=yaml sw=2 et :
+
+# START_INDENT
+map1:
+sub1:
+- list item
+map2:
+- another list
+# END_INDENT
+
+# START_INDENT
+map: &anchor
+map: val
+# END_INDENT

runtime/indent/testdir/yaml.ok

@@ -0,0 +1,14 @@
+# vim: set ft=yaml sw=2 et :
+
+# START_INDENT
+map1:
+  sub1:
+    - list item
+map2:
+  - another list
+# END_INDENT
+
+# START_INDENT
+map: &anchor
+map: val
+# END_INDENT

runtime/indent/yaml.vim

@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:         YAML
 " Maintainer:       Nikolai Pavlov <zyx.vim@gmail.com>
-" Last Change:	    2017 Jun 13
+" Last Change:	    2019 Sep 28
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -29,7 +29,7 @@ function s:FindPrevLessIndentedLine(lnum, ...)
     let curindent = a:0 ? a:1 : indent(a:lnum)
     while           prevlnum
                 \&&  indent(prevlnum) >=  curindent
-                \&& getline(prevlnum) =~# '^\s*#'
+                \&& getline(prevlnum) !~# '^\s*#'
         let prevlnum = prevnonblank(prevlnum-1)
     endwhile
     return prevlnum