fix alone tag indent

Author: weirongxu

indent/html.vim

@@ -258,6 +258,14 @@ let s:html_indent_tags = '[a-z_][a-z0-9_.-]*'
 let s:cpo_save = &cpo
 set cpo-=C
 
+" [-- count self close tags of line a:lnum --]
+fun! <SID>HtmlIndentAloneClose(lnum)
+    let s = substitute('x'.getline(a:lnum),
+    \ '.\{-}\(/>\)', "\1", 'g')
+    let s = substitute(s, "[^\1].*$", '', '')
+    return strlen(s)
+endfun
+
 " [-- count indent-increasing tags of line a:lnum --]
 fun! <SID>HtmlIndentOpen(lnum, pattern)
     let s = substitute('x'.getline(a:lnum),
@@ -290,6 +298,7 @@ fun! <SID>HtmlIndentSum(lnum, style)
         if a:style == match(getline(a:lnum), '^\s*</\<\('.s:html_indent_tags.'\)\>')
             let open = <SID>HtmlIndentOpen(a:lnum, s:html_indent_tags) - <SID>HtmlIndentOpen(a:lnum, s:html_noindent_tags)
             let close = <SID>HtmlIndentClose(a:lnum, s:html_indent_tags) - <SID>HtmlIndentClose(a:lnum, s:html_noindent_tags)
+            \ + <SID>HtmlIndentAloneClose(a:lnum)
             if 0 != open || 0 != close
                 return open - close
             endif