Rich, table-based identity signatures lost all their inline CSS
(background/text colors, fonts, border-radius, bgcolor). The composer
embeds the signature into the TipTap editor, and parsing it into the
ProseMirror schema flattened it to a generic bordered table. That
normalized version was then shown while composing AND delivered to the
recipient, even though Identity settings stored and previewed it
correctly.
Hold the signature as a dedicated, non-editable atom node
(SignatureBlock) that keeps the verbatim HTML in an attribute and renders
it inside a Shadow Root, mirroring the existing QuotedHtml island. The
markup is never parsed into the schema, so the styling survives 1:1 both
in the in-editor preview and in the outgoing mail
(serializeEditorContent inlines the verbatim HTML, as it already does for
quoted originals). The signature stays a single unit: select it and
Backspace/Delete to remove it; identity switching still swaps it via the
existing data-signature-block markers.
Adds unit coverage (parse + serialize round-trip preserves inline styles).
Fixes#475
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Replying to / forwarding a layout-heavy HTML email (nested tables, MJML,
Outlook divs) destroyed its layout: ProseMirror re-parsed the quoted body
through its strict schema and discarded anything that didn't fit. The quoted
original is now held verbatim in a new atomic QuotedHtml node and never parsed
into the schema; its NodeView renders inside a shadow root so app CSS can't
cascade in and the in-editor view matches the sent mail 1:1.
- quoted-html.ts (new): QuotedHtml atom node + shadow-DOM NodeView (inner
contentEditable for redaction), serializeEditorContent(), buildQuotedHtmlBlock().
- rich-text-editor: register the node; emit via serializeEditorContent (not
getHTML) so the verbatim island survives.
- composer: both HTML reply/forward paths embed the original as an island
(sanitize -> cid-rewrite -> buildQuotedHtmlBlock); the signature-swap effect
serializes via serializeEditorContent and treats the island as a quote
boundary so the splice never cuts into the quoted body.
atom:true means Backspace at the boundary / Ctrl+A+Delete removes the whole
quote in one go.
