[Bug]: Composer leaves a line as plain text when a dash is added in front of it later#22997

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. In the composer (rich text on), type -get md and press Shift+Enter.
2. Move the caret back and type a space after the dash, so the line reads - get md.
3. Click another line.

Expected behavior

The line shows as a bullet, the same as when you type - g in one go.

Actual behavior

The line stays plain text, but the composer saves and sends it as a Markdown list item (- get md). Anything that rebuilds the editor from the saved draft, such as attaching an image, then shows it as a bullet. The same happens when you type - in front of text that is already on the line.

The - input rule only fires while the marker is typed (-, space, first letter), so a dash or space added afterwards never becomes a list.

Impact

Minor bug or occasional failure

Version or commit

main at 680152e27b

Environment

macOS, desktop app (Nightly). Reproduced in a browser test against main.

Workaround

Delete the line and type - followed by the text in one go.