make brief_stage non-copyable and non-movable; provide swap() and reset()#7557
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…et() brief_stage owns its icons and lines buffers through raw pointers, so the implicitly generated copy/move operations silently alias those buffers across two stages. Delete them and provide a custom swap() that exchanges members (keeping each slot with a distinct buffer), plus a reset() that restores the default-constructed state. Update brief_compact_stages, the only code that assigned brief_stage objects: shift stages down by swapping (equivalent, since the removed stage buffers were already freed and the tail is cleared afterward) and clear the tail entries with reset(). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Goober5000
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Jul 5, 2026
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brief_stage owns its icons and lines buffers through raw pointers, so the implicitly generated copy/move operations silently alias those buffers across two stages. Delete them and provide a custom swap() that exchanges members (keeping each slot with a distinct buffer), plus a reset() that restores the default-constructed state.
Update brief_compact_stages, the only code that assigned brief_stage objects: shift stages down by swapping (equivalent, since the removed stage buffers were already freed and the tail is cleared afterward) and clear the tail entries with reset().