Sorry miss clicked because of brain fart

plugin/minibufexpl.vim

@@ -434,7 +434,14 @@ function! <SID>VimEnterHandler()
 
   if g:miniBufExplAutoStart && t:miniBufExplAutoUpdate == 1
         \ && (t:skipEligibleBuffersCheck == 1 || <SID>HasEligibleBuffers() == 1)
-    call <SID>StartExplorer(bufnr("%"))
+
+    " VimEnter event will be triggered after a session is loaded, if there is
+    " already a MBE window, we need to update it at this point.
+    if <SID>FindWindow('-MiniBufExplorer-', 1) == -1
+      call <SID>StartExplorer(bufnr("%"))
+    else
+      call <SID>UpdateExplorer(bufnr("%"))
+    endif
 
     " Let the MBE open in the new tab
     let s:TabsMBEState = 1
@@ -1542,10 +1549,13 @@ function! <SID>BuildBufferList(curBufNum)
         call add(l:tabList, l:tab)
     endfor
 
-    if t:miniBufExplSortBy == "name"
-        call sort(l:tabList, "<SID>NameCmp")
-    elseif t:miniBufExplSortBy == "mru"
+    if t:miniBufExplSortBy == "mru"
         call sort(l:tabList, "<SID>MRUCmp")
+    elseif t:miniBufExplSortBy == "name"
+        call sort(l:tabList, "<SID>NameCmp")
+    else
+        " Sort by buffer number by default
+        call sort(l:tabList, "<SID>NumberCmp")
     endif
 
     let l:miniBufExplBufList = ''
@@ -1976,6 +1986,15 @@ function! <SID>UpdateBufferStateDict(bufNum,deleted)
     call <SID>DEBUG('Leaving UpdateBufferStateDict()',10)
 endfunction
 
+" }}}
+" MRUCmp - compares tabs based on MRU order {{{
+"
+function! <SID>MRUCmp(tab1, tab2)
+  let l:buf1 = <SID>GetBufferNumber(a:tab1)
+  let l:buf2 = <SID>GetBufferNumber(a:tab2)
+  return index(s:MRUList, l:buf1) - index(s:MRUList, l:buf2)
+endfunction
+
 " }}}
 " NameCmp - compares tabs based on filename {{{
 "
@@ -1992,12 +2011,12 @@ function! <SID>NameCmp(tab1, tab2)
 endfunction
 
 " }}}
-" MRUCmp - compares tabs based on MRU order {{{
+" NumberCmp - compares tabs based on buffer number {{{
 "
-function! <SID>MRUCmp(tab1, tab2)
-  let l:buf1 = str2nr(matchstr(a:tab1, '[0-9]\+'))
-  let l:buf2 = str2nr(matchstr(a:tab2, '[0-9]\+'))
-  return index(s:MRUList, l:buf1) - index(s:MRUList, l:buf2)
+function! <SID>NumberCmp(tab1, tab2)
+  let l:buf1 = <SID>GetBufferNumber(a:tab1)
+  let l:buf2 = <SID>GetBufferNumber(a:tab2)
+  return l:buf1 - l:buf2
 endfunction
 
 " }}}
@@ -2124,12 +2143,34 @@ function! <SID>QuitIfLastOpen() abort
   endif
 endfunction
 
+" }}}
+" GetBufferNumber - Get the buffer number from a formated string {{{
+"
+function! <SID>GetBufferNumber(bufname)
+  call <SID>DEBUG('Entering GetBufferNumber()',10)
+  call <SID>DEBUG('The buffer name is '.a:bufname,9)
+  if !g:miniBufExplShowBufNumbers
+    " This is a bit ugly, but it works, unless we come up with a
+    " better way to get the key for a dictionary by its value.
+    let l:bufUniqNameDictKeys = keys(s:bufUniqNameDict)
+    let l:bufUniqNameDictValues = values(s:bufUniqNameDict)
+    let l:retv = l:bufUniqNameDictKeys[match(l:bufUniqNameDictValues,substitute(a:bufname,'\[*\([^\]]*\)\]*.*', '\1', ''))]
+  else
+    let l:retv = substitute(a:bufname,'\[*\([0-9]*\):[^\]]*\]*.*', '\1', '') + 0
+  endif
+  call <SID>DEBUG('The buffer number is '.l:retv,9)
+  call <SID>DEBUG('Leaving GetBufferNumber()',10)
+  return str2nr(l:retv)
+endfunction
+
 " }}}
 " GetActiveBuffer {{{
 "
 function! <SID>GetActiveBuffer()
   call <SID>DEBUG('Entering GetActiveBuffer()',10)
-  let l:bufNum = substitute(s:miniBufExplBufList,'\[\([0-9]*\):[^\]]*\][^\!]*!', '\1', '') + 0
+  let l:bufStr = substitute(s:miniBufExplBufList,'.*\(\[[0-9]*:*[^\]]*\][^\!]*!\).*', '\1', '')
+  call <SID>DEBUG('Currently active buffer is '.l:bufStr,10)
+  let l:bufNum = <SID>GetBufferNumber(l:bufStr)
   call <SID>DEBUG('Currently active buffer is '.l:bufNum,10)
   call <SID>DEBUG('Leaving GetActiveBuffer()',10)
   return l:bufNum
@@ -2160,26 +2201,17 @@ function! <SID>GetSelectedBuffer()
   let @" = ""
   normal ""yi[
   if @" != ""
-    if !g:miniBufExplShowBufNumbers
-      " This is a bit ugly, but it works, unless we come up with a
-      " better way to get the key for a dictionary by its value.
-      let l:bufUniqNameDictKeys = keys(s:bufUniqNameDict)
-      let l:bufUniqNameDictValues = values(s:bufUniqNameDict)
-      let l:retv = l:bufUniqNameDictKeys[match(l:bufUniqNameDictValues,substitute(@",'[0-9]*:\(.*\)', '\1', ''))]
-    else
-      let l:retv = substitute(@",'\([0-9]*\):.*', '\1', '') + 0
-    endif
-    let @" = l:save_reg
-    call <SID>DEBUG('Leaving GetSelectedBuffer()',10)
-    return l:retv
+    let l:retv = <SID>GetBufferNumber(@")
   else
-    let @" = l:save_reg
-    call <SID>DEBUG('Leaving GetSelectedBuffer()',10)
-    return -1
+    let l:retv = -1
   endif
+  let @" = l:save_reg
 
   let &report  = l:save_rep
   let &showcmd = l:save_sc
+
+  call <SID>DEBUG('Leaving GetSelectedBuffer()',10)
+  return l:retv
 endfunction
 
 " }}}