Dragging an image onto the markdown editor attached it to the strip (the
drop zone fired) but ProseMirror also handled the same drop, parsing the
drag's HTML into an inline image node with a blob:/localhost src. That URL
then leaked into the markdown and surfaced as a stray link-preview chip.
Add a ProseMirror handleDrop that declines drops carrying files, so the
editor stops inlining them while the drop zone still routes them to the
attachment strip. Extract the paste/drag file extraction into a shared
transferFiles helper used by both paths.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QtNQeBpkDJPC9obiB25pV6
Routing pasted images to the attachment strip wasn't enough — the editor's
ImageBlock feature still handled the paste itself and left a stuck "upload
in progress" node, since there's no public upload URL for it to resolve to.
Turn the feature off entirely. It's the root cause: it's the only thing
that registers paste/drop-to-upload. Image *links* still render through the
base commonmark schema (a plain <img>), and pasted image files continue to
go to the attachment strip via use-file-input. Drop the now-dead image-block
upload/chrome CSS and keep a simple inline-image style.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QtNQeBpkDJPC9obiB25pV6
Pasting an image while the markdown editor was focused left it stuck on
ProseMirror's inline "uploading" placeholder instead of going to the
attachment strip. The capture-phase paste interceptor bailed before it
could redirect the file because:
- pasted images usually surface only through `clipboardData.items`
(`getAsFile`), with `clipboardData.files` left empty, and
- image pastes often advertise an *empty* `text/plain` entry, which the
old `types.includes('text/plain')` check mistook for a text paste.
Read files from `items` (falling back to `files`), and gate on the actual
text payload rather than the advertised type, so real text pastes
(Excel/Word renditions) still paste as text while pure image pastes
become attachments.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QtNQeBpkDJPC9obiB25pV6
Arjun Patel