Add a little bit more whitespace removal by trimming.

[rodrigoaguilera]

When a svg with whitespaces or linebreaks at the end is passed those are preserved. I thought it would be better to remove them

[rodrigoaguilera]

I forgot to mention that when you sanitize a file with no newline at the end the process adds an unnecessary newline to the output. I think is a bug in libxml.

For me this generates a diff between the sanitized and unsanitized version of the file that I hope it can be solved upstream.

[verdy-p]

The minification of the "sanitized" SVG actually breaks it: it uses a basic replacement of all whitespace sequences into a single SPACE. This is not correct: this should not affect the whitespaces present within attribute values that take a quoted delimited string in one or several part of their values.

As well it does not minify the superfluous whitespaces present around braces, or around the colon separating an property name from its value, and does not remove the superfluous semicolon that terminates the last property within braces.

This should not be performed using a new lexical/syntaxic parsing of the result (or with the existing basic regexp substitution), but should be done instead and safely by generating the XML directly from the already loaded and sanitized DOM-like structure, where the "pretty-printing" generating whitespaces (and the extra semi-colon at end of property lists in braces) can be done (if not generating minified code), or suppressed entirely (if minifying).