Paste renamed a pasted SVG filter to a name no filter of the document
held, but an effect could still use that name, for example after its
filter was deleted. Defining a filter of that name later changed both
effects. Paste now also skips the names the document's effects use,
read only when a pasted filter needs a new name.
A new name with a tab, line feed or carriage return was written into
the filter's id as is, which XML reads as a space, so the id no longer
matched the effect's name. svg_filter::with_id now writes those
characters as character references, and paste takes a name only when
the filter's id reads back as that name.
dotCooCoo
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