[imp] Adding method to trim normal, non-breaking and multibyte spaces

[infograf768]

See discussion #4489

the code to use would be:

JFilterInput::getInstance()->clean((string) $mystring, 'trim')

[joomdonation]

Maybe you can give some sample strings (which contains non-breaking spaces and double byte whitespaces) so that we can use to test this method ?

[infograf768]

Here is a string:

nonbreaking nonbreaking
multi　multi

The spaces are in the middle. Just pick them and add first and last

[joomdonation]

@test: OK. The method successfully remove normal, non-breaking and multibyte spaces before and end of a string.

[pe7er]

I tested on staging (Joomla! 3.3.7-dev) using patch tester but issue has not been solved.

A username like " 123", that's [space] + 123 is still accepted.
and in User Manager when you edit the user details you can see the space in the form field.

[joomdonation]

@pe7er : You need to apply both this full request and #4489 before testing. Could you please try again?

[pe7er]

Sorry, I did not understand that. I'll test with #4489 patch