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The K1 frontend lowers `if`/`when` branches with their raw IR offsets collapsed onto the whole enclosing IrWhen expression, so every branch reports the same span (e.g. `stmts.kt:17:26:17:58`). K2 records per-branch spans reconstructed from the branch condition start through the result end (or just the result span for an `else` branch). Reconstruct the per-branch span from the branch's own condition/result offsets, gated on the raw branch span being collapsed onto the enclosing IrWhen (as under K1); under K2 the raw per-branch offsets already differ so the helper is a no-op. `correctedEndOffset` additionally fixes K1 recording a bare assignment's raw end at its left-hand side rather than past its right-hand value. Example (stmts.kt:17): before: 17:26:17:58 (x2, both branches collapsed onto the IrWhen) after: 17:29:17:43 and 17:50:17:58 (per-branch, matching K2) Only the K1 (test-kotlin1) expected files change; the K2 (test-kotlin2) expected files are unchanged. Controlflow expected files converge as a pure cascade of the branch-location shift. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>