Implements the deferred half of these options: a soft line break inside a
paragraph / list item can render as <br /> instead of a space.
- Parser: soft breaks now emit a dedicated InlineNode::SoftBreak node
(parse_inline_seq K::Newline + the list-continuation synthetic join) instead
of collapsing to Text(" "). Added SoftBreakNode + the variant.
- All inline consumers treat SoftBreak as whitespace: AST visitor (no-op),
text extraction (index.rs + lib.rs → space), nav/semantic_tokens span_of_inline,
semantic emit (skip like Text), parser span_of_inline.
- Renderer: render_inlines_break renders top-level SoftBreaks as the
context-specific string; render_paragraph uses text_ignore_newline,
render_list_item uses list_ignore_newline; default render_inline → space.
with_newline_handling builder; export.rs wires both from HtmlConfig.
Default (true/true = upstream default) behaviour is unchanged (space). Updated
3 core tests + 1 parser test that asserted the old Text(" ") shape to treat
SoftBreak as whitespace. New test render_page_html_ignore_newline_controls_soft_breaks.
Gap doc: P3 Config item closed — only the deferred markdown cluster remains.
Full rust suite + clippy clean; Neovim 307, Vim 301/18/21.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
gffranco
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