MPR writer appends a synthetic newline to microflow EndEvent return values

[hjotha]

Problem:

The MPR writer appends a trailing newline to non-empty EndEvent ReturnValue fields. Pristine MPRs store the return expression without that newline, and the extra character can make some return expressions fail Studio Pro validation.

Expected:

The writer should preserve the EndEvent return expression exactly, without adding synthetic trailing whitespace.

Impact:

Roundtrip rewrites differ from pristine Studio Pro output and can produce validation errors for some return contexts.

Proposed fix:

Write ReturnValue directly instead of appending \n.

[github-actions]

Issue Triage

Summary
The MPR writer incorrectly adds a trailing newline to the ReturnValue of EndEvent elements, causing round‑trip differences and validation errors in Studio Pro.

Checklist for bug report completeness

Required info	Present?	Details
mxcli version	❌	Not mentioned
Mendix version	❌	Not mentioned
Scenario (what the user was doing)	❌	No CLI command or MDL script described
Expected output	✅	Stated: writer should preserve the expression without extra newline
Experienced output	❌	No error message, wrong result, or crash details provided
AI bug report (mxcli diag --bundle or session log)	❌	Not included

What’s needed
To help us reproduce and fix the issue, could you please add:

1. The version of mxcli you’re using (mxcli --version or commit/build info).
2. The Mendix version of the project you’re processing (e.g., 10.6.0, 9.24.1).
3. The exact command or MDL script you ran that triggered the problem.
4. The actual output you observed (any error message, diff, or validation failure).
5. If possible, run mxcli diag --bundle and attach the resulting archive, or at least share the relevant session log.

Once we have those details, we’ll be able to investigate the newline addition and verify the fix. Thank you for reporting this!

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