Detect heading levels from Google Docs styled paragraphs

[caio-pizzol]

Summary

Detect and preserve heading levels (H1, H3-H6) when pasting from Google Docs, which converts them to styled <p> tags.

Problem

When pasting content with H1, H3-H6 headings from Google Docs, they lose their heading level and paste as plain paragraphs. Only H2 is reliably preserved as a heading tag.

Repro

1. Create a Google Doc with headings at all levels (H1 through H6).
2. Copy the content and paste into SuperDoc.
3. Only H2 headings are preserved. H1 and H3-H6 paste as regular paragraphs.

Expected

All heading levels from pasted content are preserved in SuperDoc.

Notes

Google Docs converts most heading levels to <p> tags with inline font-size/font-weight styling instead of semantic <h1>-<h6> tags. The paragraph.parseDOM has rules for h1-h6 but they never fire for these styled <p> elements.

The fix should detect heading-like paragraphs by font-size/font-weight in the Google Docs paste handler before ProseMirror parsing, and convert them to proper <h1>-<h6> tags. Google Docs typically uses predictable font sizes for each heading level (e.g., 24pt=H1, 18pt=H2, 14pt=H3, etc.).

File: packages/super-editor/src/core/inputRules/google-docs-paste/google-docs-paste.js

copy-paste-test.docx

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Want to work on this? Check the Contributing Guide to get started. Comment on this issue to let us know you're picking it up.

Ref: SD-1981

[linear]

IT-573