From 888934a3beb5ef69d90664c74eea0d96bfbfd087 Mon Sep 17 00:00:00 2001
From: Martin Grenfell <martin_grenfell@msn.com>
Date: Sun, 14 Dec 2008 00:40:17 +1300
Subject: [PATCH] make TreeFileNode#isRoot() assume a tree exists for current
 buf, not tab

---
 plugin/NERD_tree.vim | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index b366d71..ecc7a21 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -593,9 +593,10 @@ endfunction
 "FUNCTION: TreeFileNode.isRoot() {{{3
 "returns 1 if this node is b:NERDTreeRoot
 function! s:TreeFileNode.isRoot()
-    if !s:treeExistsForTab()
-        throw "NERDTree.TreeFileNode.IsRoot exception: No tree exists for the current tab"
+    if !s:treeExistsForBuf()
+        throw "NERDTree.NoTreeError: No tree exists for the current buffer"
     endif
+
     return self.equals(b:NERDTreeRoot)
 endfunction
 
@@ -1794,6 +1795,11 @@ function! s:initNerdTreeInPlace(dir)
 
     call s:renderView()
 endfunction
+" Function: s:treeExistsForBuffer()   {{{2
+" Returns 1 if a nerd tree root exists in the current buffer
+function! s:treeExistsForBuf()
+    return exists("b:NERDTreeRoot")
+endfunction
 " Function: s:treeExistsForTab()   {{{2
 " Returns 1 if a nerd tree root exists in the current tab
 function! s:treeExistsForTab()