Hello
Detected Moodle 2.8.6+

When we upload (or create) a new theme and we named > 28 chars (8 + 20 chars + suffix and prefix chars) there are a bug:

name is too long. Limit is 28 chars

• The solution is a little change in moodle/lib/xmldb/xmldb.xsd. You should change line 13
  and rewrite

  <xs:pattern value='[0-9a-z_]{1,X}'/>

  
  X = number of characters accepted

• and moodle/lib/xmldb/xmldb_table.php. You should change line 47
  and rewrite

  const NAME_MAX_LENGTH = X;

  
  X = number of characters accepted

In my development I have written X = 50, for example:

<xs:pattern value='[0-9a-z_]{1,50}'/>

const NAME_MAX_LENGTH = 50;

And it's ok!

In my opinion, may be, this parameter "X" It could be controlled through Moodle administration or be expanded.
I request the development for this parameter to be controlled through the administration panel in future versions.

Thanks