preservim#1344 Fixes NERDTreeFind: Exception not caught: NERDTree.InvalidArgumentsError: <file> should be under <path>

Author: dangibson

lib/nerdtree/path.vim

@@ -530,8 +530,14 @@ function! s:Path.isUnder(parent)
         return 0
     endif
     for i in range(0, l:that_count-1)
-        if self.pathSegments[i] !=# a:parent.pathSegments[i]
-            return 0
+        if nerdtree#runningWindows()
+            if lower(self.pathSegments[i]) !=# lower(a:parent.pathSegments[i])
+                return 0
+            endif
+        else
+            if self.pathSegments[i] !=# a:parent.pathSegments[i]
+                return 0
+            endif
         endif
     endfor
     return 1

lib/nerdtree/tree_dir_node.vim

@@ -121,8 +121,14 @@ function! s:TreeDirNode.findNode(path)
     if a:path.equals(self.path)
         return self
     endif
-    if stridx(a:path.str(), self.path.str(), 0) ==# -1
-        return {}
+    if nerdtree#runningWindows()
+        if stridx(lower(a:path.str()), lower(self.path.str()), 0) ==# -1
+            return {}
+        endif
+    else
+        if stridx(a:path.str(), self.path.str(), 0) ==# -1
+            return {}
+        endif
     endif
 
     if self.path.isDirectory