Don't strip any whitespaces from SVG text/tspan nodes
white-space: pre
and other white-space modes rely on whitespaces in
the text being preserved as-is. Stripping any whitespaces will alter how
the text is displayed, so don't do that. This fixes text like:
<text style="white-space:pre"><tspan>After <tspan
style="font-style:italic">italic</tspan>
</tspan><tspan>there is a line break</tspan></text>
@dkazakov wdyt, since you implemented most of this in bde1adee?
And CC @woltherav for 4b447ed9
Relates to !1849 (merged)
Edited by Alvin Wong