What changed

When the open note changes on disk (an editor, Obsidian, a coding agent), each changed section gets a number after its heading (## How long to simmer¹; a removed section’s number sits in the margin where it was), the running head says ³ changed, the Info tab lists them (¹ How long to simmer +2 −2; an added one says new, a removed one is struck through; past 8 a + n more sections row opens the rest) and the toast says reloaded · ³ sections changed. All that is local and works without an ai block; it compares with the text the note had when you opened it, held in memory only.

Explain it

D sends only the changed hunks. While the model works, Info shows ▍ asking <model> · 3 s where the reply will go; then one or two sentences about the change and a few words under each section, and the numbers turn muted.

⏎ on a changed section goes there (to the changed line when the reply quoted one, with the number beside it) and shows its note in a footnote under a short rule, ¹ of 3 · ] next. [ ] walk the changes, 3 opens Info, esc hides the footnote.

• ⏎ on the Changed label opens the Proof sheet (below).
• Below 100 columns D goes straight to the first change and the explanation arrives in its footnote.
• With the panel hidden and room in the right margin (155 columns, 147 without the minimap) the notes sit beside their headings instead, the summary on top.
• Once explained, the baseline moves forward, so the next edit lists anew and the explanation stays, dimmed, under Earlier.
• D again cancels. A failure stays in the block (✗ …) and D retries.
• Past the size cap later sections are listed by heading while they fit, then counted (… and 12 more sections); a reply that runs long keeps its summary and the section notes it finished.
• A note over 2 MB is not compared (not compared, reloaded · too large to compare). The same goes for a reload that rewrites too many lines to compare quickly.
• Explanations are never written to disk.

The Proof sheet

⏎ on the Changed label in Info opens What changed, a popup with every changed section and its real lines, as written: − for a removed line, + for an added one, a line of context around them, … between hunks. A line wider than the popup is cut around the change. An added or removed section shows its first 20 lines, then … 12 more lines; a section too big to compare line by line shows its new text under rewritten · showing the new text. It works without an ai block.

Once D has explained the change, the summary sits on top and each section’s note under its name. D works inside the sheet too: a ▍ asking <model> · 3 s row holds the top while the model works, and the sheet stays where it is.

• ↑ ↓ (or j k, tab) move between sections, PgUp PgDn page.
• ⏎ (or a click) closes the sheet and goes to the section, landing as above; a removed section has nowhere to go (section removed).
• esc closes it. A reload that leaves the note as it was closes it too.