Update title of pull request. Add PR authors where missing.

* support for default viewer in Windows

* updated changelog

* Update nerdtree_plugin/fs_menu.vim

Co-authored-by: Phil Runninger <PhilRunninger@users.noreply.github.com>

* Update nerdtree_plugin/fs_menu.vim

Co-authored-by: Phil Runninger <PhilRunninger@users.noreply.github.com>

Co-authored-by: Phil Runninger <PhilRunninger@users.noreply.github.com>

CHANGELOG.md

@@ -5,6 +5,13 @@
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
 #### 6.7
+- **.13**: `cmd.exe /c start "" <filename>` for windows default viewer support. (J. Altayó) [#1130](https://github.com/preservim/nerdtree/pull/1130)
+- **.12**: Fixed a bug that caused the file-tree construction to slow down significantly. (Eugenij-W) [#1126](https://github.com/preservim/nerdtree/pull/1126)
+- **.11**: Fix exception in NERDTreeFind (on windows OS and If the file is located in the root directory of the disk) (Eugenij-W) [#1122](https://github.com/preservim/nerdtree/pull/1122)
+- **.10**: Do not consider the tree root to be "cascadable". (lifecrisis) [#1120](https://github.com/preservim/nerdtree/pull/1120)
+- **.9**: Force `:NERDTreeFocus` to allow events to be fired when switching windows. (PhilRunninger) [#1118](https://github.com/preservim/nerdtree/pull/1118)
+- **.8**: Fix example code for the `NERDTreeAddKeyMap()` function. (PhilRunninger) [#1116](https://github.com/preservim/nerdtree/pull/1116)
+- **.7**: Put `'%'` argument in `bufname()` for backwards compatibility. (PhilRunninger) [#1105](https://github.com/preservim/nerdtree/pull/1105)
 - **.6**: If a file's already open in the window, don't edit it again. (PhilRunninger) [#1103](https://github.com/preservim/nerdtree/pull/1103)
 - **.5**: Prevent unneeded tree creation in `:NERDTreeToggle[VCS] <path>` (PhilRunninger) [#1101](https://github.com/preservim/nerdtree/pull/1101)
 - **.4**: Add missing calls to the `shellescape()` function (lifecrisis) [#1099](https://github.com/preservim/nerdtree/pull/1099)

doc/NERDTree.txt

@@ -1353,12 +1353,12 @@ NERDTreeAddKeyMap({options})                               *NERDTreeAddKeyMap()*
     Example: >
         call NERDTreeAddKeyMap({
                \ 'key': 'foo',
-               \ 'callback': 'NERDTreeCDHandler',
+               \ 'callback': 'NERDTreeEchoPathHandler',
                \ 'quickhelpText': 'echo full path of current node',
                \ 'scope': 'DirNode' })
 
-        function! NERDTreeCDHandler(dirnode)
-            call a:dirnode.changeToDir()
+        function! NERDTreeEchoPathHandler(dirnode)
+            echo a:dirnode.path.str()
         endfunction
 <
     This code should sit in a file like ~/.vim/nerdtree_plugin/mymapping.vim.

lib/nerdtree/creator.vim

@@ -249,7 +249,11 @@ function! s:Creator._pathForString(str)
         if dir =~# '^\.'
             let dir = getcwd() . g:NERDTreePath.Slash() . dir
         endif
-        let dir = g:NERDTreePath.Resolve(dir)
+
+        "hack to prevent removing slash if dir is the root of the file system.
+        if dir !=# '/'
+            let dir = g:NERDTreePath.Resolve(dir)
+        endif
 
         try
             let path = g:NERDTreePath.New(dir)

lib/nerdtree/nerdtree.vim

@@ -96,9 +96,9 @@ endfunction
 
 "FUNCTION: s:NERDTree.CursorToTreeWin(){{{1
 "Places the cursor in the nerd tree window
-function! s:NERDTree.CursorToTreeWin()
+function! s:NERDTree.CursorToTreeWin(...)
     call g:NERDTree.MustBeOpen()
-    call nerdtree#exec(g:NERDTree.GetWinNum() . 'wincmd w', 1)
+    call nerdtree#exec(g:NERDTree.GetWinNum() . 'wincmd w', a:0 >0 ? a:1 : 1)
 endfunction
 
 " Function: s:NERDTree.ExistsForBuffer()   {{{1

lib/nerdtree/path.vim

@@ -296,7 +296,7 @@ endfunction
 " FUNCTION: Path.edit() {{{1
 function! s:Path.edit()
     let l:bufname = self.str({'format': 'Edit'})
-    if bufname() !=# l:bufname
+    if bufname('%') !=# l:bufname
         exec 'edit ' . l:bufname
     endif
 endfunction
@@ -546,26 +546,36 @@ endfunction
 " return 1 if this path is somewhere above the given path in the filesystem.
 "
 " a:path should be a dir
-function! s:Path.isAncestor(path)
-    if !self.isDirectory
-        return 0
-    endif
-
-    let this = self.str()
-    let that = a:path.str()
-    return stridx(that, this) ==# 0
+function! s:Path.isAncestor(child)
+    return a:child.isUnder(self)
 endfunction
 
 " FUNCTION: Path.isUnder(path) {{{1
 " return 1 if this path is somewhere under the given path in the filesystem.
-function! s:Path.isUnder(path)
-    if a:path.isDirectory ==# 0
+function! s:Path.isUnder(parent)
+    if a:parent.isDirectory ==# 0
         return 0
     endif
-
-    let this = self.str()
-    let that = a:path.str()
-    return stridx(this, that . s:Path.Slash()) ==# 0
+    if nerdtree#runningWindows() && a:parent.drive !=# self.drive
+        return 0
+    endif
+    let l:this_count = len(self.pathSegments)
+    if l:this_count ==# 0
+        return 0
+    endif
+    let l:that_count = len(a:parent.pathSegments)
+    if l:that_count ==# 0
+        return 1
+    endif
+    if l:that_count >= l:this_count
+        return 0
+    endif
+    for i in range(0, l:that_count-1)
+        if self.pathSegments[i] !=# a:parent.pathSegments[i]
+            return 0
+        endif
+    endfor
+    return 1
 endfunction
 
 " FUNCTION: Path.JoinPathStrings(...) {{{1

lib/nerdtree/tree_dir_node.vim

@@ -377,11 +377,17 @@ endfunction
 "  1. If cascaded, we don't know which dir is bookmarked or is a symlink.
 "  2. If the parent is a symlink or is bookmarked, you end up with unparsable
 "     text, and NERDTree cannot get the path of any child node.
+" Also, return false if this directory is the tree root, which should never be
+" part of a cascade.
 function! s:TreeDirNode.isCascadable()
     if g:NERDTreeCascadeSingleChildDir ==# 0
         return 0
     endif
 
+    if self.isRoot()
+        return 0
+    endif
+
     if self.path.isSymLink
         return 0
     endif
@@ -425,6 +431,7 @@ function! s:TreeDirNode._initChildren(silent)
         endtry
     endfor
 
+    let g:NERDTreeOldSortOrder = g:NERDTreeSortOrder
     call self.sortChildren()
 
     call nerdtree#echo('')

nerdtree_plugin/fs_menu.vim

@@ -34,6 +34,10 @@ if executable('xdg-open')
     call NERDTreeAddMenuItem({'text': '(o)pen the current node with system editor', 'shortcut': 'o', 'callback': 'NERDTreeExecuteFileLinux'})
 endif
 
+if nerdtree#runningWindows()
+    call NERDTreeAddMenuItem({'text': '(o)pen the current node with system editor', 'shortcut': 'o', 'callback': 'NERDTreeExecuteFileWindows'})
+endif
+
 if g:NERDTreePath.CopyingSupported()
     call NERDTreeAddMenuItem({'text': '(c)opy the current node', 'shortcut': 'c', 'callback': 'NERDTreeCopyNode'})
 endif
@@ -451,4 +455,15 @@ function! NERDTreeExecuteFileLinux()
     call system('xdg-open ' . shellescape(l:node.path.str()))
 endfunction
 
+" FUNCTION: NERDTreeExecuteFileWindows() {{{1
+function! NERDTreeExecuteFileWindows()
+    let l:node = g:NERDTreeFileNode.GetSelected()
+
+    if empty(l:node)
+        return
+    endif
+
+    call system('cmd.exe /c start "" ' . shellescape(l:node.path.str()))
+endfunction
+
 " vim: set sw=4 sts=4 et fdm=marker:

plugin/NERD_tree.vim

@@ -217,7 +217,7 @@ endfunction
 
 function! NERDTreeFocus()
     if g:NERDTree.IsOpen()
-        call g:NERDTree.CursorToTreeWin()
+        call g:NERDTree.CursorToTreeWin(0)
     else
         call g:NERDTreeCreator.ToggleTabTree('')
     endif