[issue#2367]: clear rootDir cache after rooter pattern changed (#2370)

> SpaceVim will try to find root before loadding custom config,
  > so that is why It can not find your project root. yes, if the
  > project rooter patterns is change the cache should be cleared.

  The fix here is create a shadow copy of
  `g:spacevim_project_rooter_pattern` and if user changed it should
  be different from the shadow version, we clear the cache and sync
  them again.

autoload/SpaceVim/plugins/projectmanager.vim

@@ -16,6 +16,7 @@
 
 
 call add(g:spacevim_project_rooter_patterns, '.SpaceVim.d/')
+let s:spacevim_project_rooter_patterns = copy(g:spacevim_project_rooter_patterns)
 
 let s:project_paths = {}
 
@@ -79,6 +80,12 @@ function! SpaceVim#plugins#projectmanager#reg_callback(func) abort
 endfunction
 
 function! SpaceVim#plugins#projectmanager#current_root() abort
+  " if rooter patterns changed, clear cache.
+  " https://github.com/SpaceVim/SpaceVim/issues/2367
+  if join(g:spacevim_project_rooter_patterns, ':') !=# join(s:spacevim_project_rooter_patterns, ':')
+    call setbufvar('%', 'rootDir', '')
+    let s:spacevim_project_rooter_patterns = copy(g:spacevim_project_rooter_patterns)
+  endif
   let rootdir = getbufvar('%', 'rootDir', '')
   if empty(rootdir)
     let rootdir = s:find_root_directory()

wiki/en/Following-HEAD.md

@@ -12,7 +12,11 @@ The next release is v1.0.1
 
 ### Fixed
 
-### Doc
+- Clear rootDir cache after rooter pattern change([#2370](https://github.com/SpaceVim/SpaceVim/pull/2370))
+
+### Removed
+
+### Doc, Wiki && Website
 
 ### Others