Fixed #604: Remove indent condition for multi command folding

autoload/vimtex/fold.vim

@@ -443,20 +443,18 @@ function! s:cmd_multi(cmds) " {{{1
 
   let l:fold = {}
   let l:fold.re = {
-        \ 'start' : l:re,
+        \ 'start' : l:re . '.*(\{|\[)\s*(\%.*)?$',
         \ 'end' : '^\s*}\s*$',
         \ 'text' : l:re . '\{[^}]*\}'
         \}
 
   function! l:fold.level(line, lnum) dict
     if a:line =~# self.re.start
-          \ && indent(a:lnum+1) > indent(a:lnum)
-      let self.indent = indent(a:lnum)
+      let self.opened = 1
       return 'a1'
-    elseif has_key(self, 'indent')
+    elseif has_key(self, 'opened')
           \ && a:line =~# self.re.end
-          \ && indent(a:lnum) == self.indent
-      unlet self.indent
+      unlet self.opened
       return 's1'
     endif
     return ''

doc/vimtex.txt

@@ -498,10 +498,7 @@ Options~
   `single_opt`    Useful for commands that open with a single long optional
                 argument, then a short "real" argument.
   `multi`         Useful for commands that start with a short regular argument
-                and continue with long optional and/or regular arguments. In
-                order for the folding to work as expected, this style depends
-                on the indentation to be correct. See the example below for
-                how to properly format the folded regions.
+                and continue with long optional and/or regular arguments.
 
   The option combines the contents of |g:vimtex_fold_commands| and
   |g:vimtex_fold_commands_default|. Entries in the former will have higher