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The `@`-mention and `/`-command suggestion popups defaulted to `placement: "bottom-start"`, so they stayed below the caret whenever any space existed below it — even when far more room was above. In bottom-anchored composers (chat input, issue comment/reply) that meant the list opened down over the send controls and, near the viewport bottom, was squashed or clipped off-screen. Two compounding causes: - The preferred side was the cramped one. Composers' roomy side is above the caret, so default to `top-start`; `flip` still sends it down when the caret is near the viewport top. - The floating-ui `size` middleware wrote `maxHeight` on the outer wrapper, which does not clip — the inner list is the scroll container and carried its own fixed `max-h-[300px]/[420px]`. That viewport-unaware cap was the real height authority and could overflow. Publish the size middleware's `availableHeight` as a CSS var and have the list clamp to `min(designMax, availableHeight)`, so there is a single, viewport-aware height authority. Drop the old `Math.max(120, ...)` floor that forced overflow in tight bands. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>