gh-124452: Fix header mismatches when folding/unfolding with email message #130511

Job	Run time
Change detection / Compute changed files	13s
Check if Autoconf files are up to date	25s
Check if generated files are up to date	3m 50s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.0.15)	1m 56s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.1.7)	2m 10s
Address sanitizer	9m 4s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.2.3)	2m 9s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.3.2)	2m 5s
Windows MSI${{ '' }}	0s
CIFuzz	0s
Hypothesis tests on Ubuntu	6m 31s
Thread sanitizer / Thread sanitizer	3m 3s
WASI / build and test	6m 2s
Thread sanitizer (free-threading) / Thread sanitizer	7m 30s
Windows / build (arm64)	3m 9s
Windows / build and test (Win32)	15m 44s
Windows (free-threading) / build (arm64)	3m 30s
Windows (free-threading) / build and test (Win32)	23m 28s
Windows / build and test (x64)	15m 48s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 21s
Windows (free-threading) / build and test (x64)	24m 6s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 44s
macOS / build and test (macos-13)	9m 20s
Ubuntu / build and test (ubuntu-22.04)	8m 28s
Ubuntu (free-threading) / build and test (ubuntu-22.04)	9m 30s
Docs / Docs	2m 5s
Docs / Docs (Oldest Sphinx)	2m 8s
Docs / Doctest	29m 55s
All required checks pass	7s
	3h 22m 21s

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