Sets the status line of the location window.

Shows the command used to produce the error list on the status line of
the location window.  Also fixed a (harmless) refresh bug.

plugin/syntastic.vim

@@ -135,7 +135,6 @@ function! s:UpdateErrors(auto_invoked, ...)
     end
 
     let loclist = g:SyntasticLoclist.current()
-    call s:notifiers.refresh(loclist)
 
     if g:syntastic_always_populate_loc_list || g:syntastic_auto_jump
         call setloclist(0, loclist.filteredRaw())
@@ -143,6 +142,8 @@ function! s:UpdateErrors(auto_invoked, ...)
             silent! lrewind
         endif
     endif
+
+    call s:notifiers.refresh(loclist)
 endfunction
 
 "clear the loc list for the buffer
@@ -178,6 +179,7 @@ function! s:CacheErrors(...)
 
                 if !loclist.isEmpty()
                     let newLoclist = newLoclist.extend(loclist)
+                    call newLoclist.setName(checker.getName())
 
                     "only get errors from one checker at a time
                     break

plugin/syntastic/loclist.vim

@@ -23,6 +23,8 @@ function! g:SyntasticLoclist.New(rawLoclist)
     let newObj._rawLoclist = llist
     let newObj._hasErrorsOrWarningsToDisplay = -1
 
+    let newObj._name = ''
+
     return newObj
 endfunction
 
@@ -59,6 +61,14 @@ function! g:SyntasticLoclist.getLength()
     return len(self._rawLoclist)
 endfunction
 
+function! g:SyntasticLoclist.getName()
+    return len(self._name)
+endfunction
+
+function! g:SyntasticLoclist.setName(name)
+    let self._name = a:name
+endfunction
+
 function! g:SyntasticLoclist.hasErrorsOrWarningsToDisplay()
     if self._hasErrorsOrWarningsToDisplay >= 0
         return self._hasErrorsOrWarningsToDisplay
@@ -140,6 +150,17 @@ function! g:SyntasticLoclist.show()
         if num != winnr()
             wincmd p
         endif
+
+        " try to find the loclist window and set w:quickfix_title
+        for buf in tabpagebuflist()
+            if buflisted(buf) && bufloaded(buf) && getbufvar(buf, '&buftype') ==# 'quickfix'
+                let win = bufwinnr(buf)
+                let title = getwinvar(win, 'quickfix_title', '')
+                if title ==# ':setloclist()' || strpart(title, 0, 16) ==# ':SyntasticCheck '
+                    call setwinvar(win, 'quickfix_title', ':SyntasticCheck ' . self._name)
+                endif
+            endif
+        endfor
     endif
 endfunction