preserve whitespace in svg text elements, when used in a reactor window

[schanzer]

(addresses #573)

[blerner]

This seems like the wrong fix to me, or at least, is too stringent. I suspect you want white-space: pre-wrap, since you want text to look like well-formatted text, not necessarily code. And what you likely really wanted was multiple lines of text, so you want to the white-space option that preserves linebreaks but in other respects formats text as text, hence pre-wrap.

[schanzer]

I want a string to render as a TEXT node within an SVG exactly as it would render in Pyret using text. No line wrapping. (although it would be pretty cool if Pyret supported line wrapping someday!)