remove '.. (up a dir)' when NERDTreeMinimalUI is set

Shortening this line doesnt add anything to the UI (functionally
speaking), but removing frees up an extra line. Anyone who sets
NERDTreeMinimalUI probably uses the u/U mappings anyway.

Author: scrooloose

plugin/NERD_tree.vim

@@ -150,11 +150,7 @@ let s:NERDTreeBufName = 'NERD_tree_'
 
 let s:tree_wid = 2
 let s:tree_markup_reg = '^[ `|]*[\-+~▾▸ ]*'
-if g:NERDTreeMinimalUI == 0
-    let s:tree_up_dir_line = '.. (up a dir)'
-else
-    let s:tree_up_dir_line = '..'
-endif
+let s:tree_up_dir_line = '.. (up a dir)'
 
 "the number to add to the nerd tree buffer name to make the buf name unique
 let s:next_buffer_number = 1
@@ -3313,8 +3309,10 @@ function! s:renderView()
     endif
 
     "add the 'up a dir' line
-    call setline(line(".")+1, s:tree_up_dir_line)
-    call cursor(line(".")+1, col("."))
+    if !g:NERDTreeMinimalUI
+        call setline(line(".")+1, s:tree_up_dir_line)
+        call cursor(line(".")+1, col("."))
+    endif
 
     "draw the header line
     let header = b:NERDTreeRoot.path.str({'format': 'UI', 'truncateTo': winwidth(0)})