# PR#80: A Plus in the Text Is No Added Line

> **WARNING:** This document describes only the change applied in this PR.
> It may already be outdated once the next PR is merged.
> Historic PR documentation is not maintained along with new PRs; treat it as a snapshot.

## Related Links

- [werkregie PR#15](https://git.javagil.de/mi/werkregie/pulls/15): three rounds lost to this false alarm.

## Problem

PR-Agent shows the model each diff line as its line number and its text;
an added line has `+` right after the number, an unchanged line has only spaces there.
A Werkbaum file marks an optional node with a `+` at the start of its text, e.g. `+ [?] #dash.notify`.
The model took such unchanged lines for added ones and reported in three rounds of werkregie PR#15
that the PR document left out nodes that were on `main` for long.
A Markdown list item with `-` or `+` can mislead it the same way.

## Non-Goals

- No change of PR-Agent's diff format.

## Specification

### Feature: the model tells the text from the marker

#### Scenario#80.01: an unchanged line whose text starts with a plus or a minus gets a note

So that the model does not report an unchanged optional node or list item as changed.

- **Given** a diff with an unchanged line whose text starts with `+` or `-`
- **When** werkrevisor builds the instructions for the model
- **Then** they explain that only a marker right after the line number marks a changed line

##### Verified by

- [test_diff_marker_note.DiffMarkerNoteTest.test_an_unchanged_line_with_a_plus_gets_the_note](../../tests/test_diff_marker_note.py)
- [test_diff_marker_note.DiffMarkerNoteTest.test_an_unchanged_markdown_item_gets_the_note](../../tests/test_diff_marker_note.py)

#### Scenario#80.02: a diff without such a line gets no note

So that the prompt stays as short as before.

- **Given** a diff whose unchanged lines start with no `+` or `-`
- **When** werkrevisor builds the instructions for the model
- **Then** they hold no such note

##### Verified by

- [test_diff_marker_note.DiffMarkerNoteTest.test_a_plain_diff_gets_no_note](../../tests/test_diff_marker_note.py)

## Solution

- werkrevisor adds the note to the instructions when an unchanged line of the diff starts with `+` or `-`
  after its indentation.
- Version 0.32.7.