Add option to disable collapsing of diretory names

doc/NERD_tree.txt

@@ -668,14 +668,18 @@ NERD tree. These options should be set in your vimrc.
 |'NERDTreeWinSize'|             Sets the window size when the NERD tree is
                                 opened.
 
-|'NERDTreeMinimalUI'|           Disables display of the 'Bookmarks' label and 
+|'NERDTreeMinimalUI'|           Disables display of the 'Bookmarks' label and
                                 'Press ? for help' text.
 
+|'NERDTreeCascadeSingleChildDir'|
+                                Collapses on the same line directories that
+                                have only one child directory.
+
 |'NERDTreeCascadeOpenSingleChildDir'|
                                 Cascade open while selected directory has only
                                 one child that also is a directory.
 
-|'NERDTreeAutoDeleteBuffer'|    Tells the NERD tree to automatically remove 
+|'NERDTreeAutoDeleteBuffer'|    Tells the NERD tree to automatically remove
                                 a buffer when a file is being deleted or renamed
                                 via a context menu command.
 
@@ -984,7 +988,18 @@ of the following lines to set this option: >
 <
 
 ------------------------------------------------------------------------------
-                                          *'NERDTreeCascadeOpenSingleChildDir'*
+                                             *'NERDTreeCascadeSingleChildDir'*
+Values: 0 or 1
+Default: 1.
+
+When displaying dir nodes, this option tells NERDTree to collapse dirs that
+have only one child. Use one of the follow lines to set this option: >
+    let NERDTreeCascadeSingleChildDir=0
+    let NERDTreeCascadeSingleChildDir=1
+<
+
+------------------------------------------------------------------------------
+                                         *'NERDTreeCascadeOpenSingleChildDir'*
 Values: 0 or 1
 Default: 1.
 
@@ -998,7 +1013,7 @@ useful for Java projects. Use one of the follow lines to set this option: >
 <
 
 ------------------------------------------------------------------------------
-                                          *'NERDTreeAutoDeleteBuffer'*
+                                                  *'NERDTreeAutoDeleteBuffer'*
 Values: 0 or 1
 Default: 0.
 

lib/nerdtree/tree_dir_node.vim

@@ -250,6 +250,10 @@ endfunction
 "FUNCTION: TreeDirNode.isCascadable() {{{1
 "true if this dir has only one visible child - which is also a dir
 function! s:TreeDirNode.isCascadable()
+    if g:NERDTreeCascadeSingleChildDir == 0
+        return 0
+    endif
+
     let c = self.getVisibleChildren()
     return len(c) == 1 && c[0].path.isDirectory
 endfunction

plugin/NERD_tree.vim

@@ -74,6 +74,7 @@ else
     call s:initVariable("g:NERDTreeDirArrowCollapsible", "~")
 endif
 call s:initVariable("g:NERDTreeCascadeOpenSingleChildDir", 1)
+call s:initVariable("g:NERDTreeCascadeSingleChildDir", 1)
 
 if !exists("g:NERDTreeSortOrder")
     let g:NERDTreeSortOrder = ['\/$', '*', '\.swp$',  '\.bak$', '\~$']