Prevent unneeded tree creation in :NERDTreeToggle[VCS] <path> (#1101)

* Don't recreate the NERDTree if its root is the same as being requested.

* Use single quotes per Vint's style recommendation.

* Update version number in changelog.

* Use a simpler method of getting the NERDTree root path.

* Remove variable. Just compare agains the function call's result.

CHANGELOG.md

@@ -5,6 +5,7 @@
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
 #### 6.7
+- **.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)
 - **.3**: Fix vsplit to not open empty buffers when opening previously closed file (AwkwardKore) [#1098](https://github.com/preservim/nerdtree/pull/1098)
 - **.2**: Fix infinity loop (on winvim) in FindParentVCSRoot (Eugenij-W) [#1095](https://github.com/preservim/nerdtree/pull/1095)

lib/nerdtree/creator.vim

@@ -366,7 +366,7 @@ function! s:Creator.toggleTabTree(dir)
     if g:NERDTree.ExistsForTab()
         if !g:NERDTree.IsOpen()
             call self._createTreeWin()
-            if !empty(a:dir)
+            if !empty(a:dir) && a:dir !=# b:NERDTree.root.path.str()
                 call self.createTabTree(a:dir)
             elseif !&hidden
                 call b:NERDTree.render()