Use independent variable to track window splitting

Since s:splitMode != '' no longer implies that a split was triggered,
we need to track that fact with a different variable.

plugin/bufexplorer.vim

@@ -132,6 +132,7 @@ let s:originBuffer = 0
 let s:running = 0
 let s:sort_by = ["number", "name", "fullpath", "mru", "extension"]
 let s:splitMode = ""
+let s:didSplit = 0
 let s:types = {"fullname": ':p', "path": ':p:h', "relativename": ':~:.', "relativepath": ':~:.:h', "shortname": ':t'}
 
 " Setup the autocommands that handle the MRUList and other stuff. {{{2
@@ -361,6 +362,7 @@ function! s:Cleanup()
 
     let s:running = 0
     let s:splitMode = ""
+    let s:didSplit = 0
 
     delmarks!
 endfunction
@@ -453,6 +455,9 @@ function! BufExplorer()
 
         " Restore the original settings.
         let [&splitbelow, &splitright] = [_splitbelow, _splitright]
+
+        " Remember that a split was triggered
+        let s:didSplit = 1
     endif
 
     if !exists("b:displayMode") || b:displayMode != "winmanager"
@@ -1038,7 +1043,7 @@ function! s:Close()
     endif
 
     " If we needed to split the main window, close the split one.
-    if s:splitMode != "" && bufwinnr(s:originBuffer) != -1
+    if s:didSplit == 1 && bufwinnr(s:originBuffer) != -1
         execute "wincmd c"
     endif