[3.13] gh-124452: Fix header mismatches when folding/unfolding with email message (GH-125919)#126917

bitdancer merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-ed81971-3.13miss-islington/cpython:backport-ed81971-3.13Copy head branch name to clipboard