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Typing `@s` in a stream showed the matching channel members, then about half a second later added people from outside the channel. The chooser sits on the composer and grows upward, so each late row pushed every shown row up and a tap could land on the wrong person. It happened every time, even for a query typed moments earlier, because each new `@` started its directory search from nothing. ### Changes - **Search cache.** Finished directory searches are kept per community and signer, in a small LRU keyed by query (`MentionSearchCache`). A query searched before shows its people at once while a fresh search runs in the background. A query not searched yet starts from the longest searched query it extends (`@si` starts from `@s`), since a name-prefix search for a longer query finds no one the shorter one missed (up to the search's result limit). This replaces the per-opening "last search" that reset on every new `@`. - **Rows hold still.** While a query's directory search can still add people or a retry row (`mentionSearchPendingProvider`), the chooser reserves its full height with rows at the top, so late rows fill empty space instead of moving shown rows. This includes the background refresh of a cached query. The reservation lasts until the query or the opening changes, so the panel never shrinks under the finger either. - **Three rows, with progress.** The chooser has a fixed three-row height (fewer rows at larger text sizes) before it scrolls, and never taller than the space above the composer (so a short view, such as landscape with the keyboard up, keeps its rows on screen). While the search runs, a thin bar overlays its top edge without changing its height. The trade-off: while a query's search runs, the panel is full height even when it ends with one or two rows. ### Demo iPhone 18 Pro simulator, local relay. Sam and Sasha are channel members; Saba, Sierra and Skyler come from the directory search. https://github.com/user-attachments/assets/efae33ce-ee65-447b-9402-b0741c8dc2da ### Before merge - [x] Kenny Lopez reviews the visible changes ([approved in Buzz #buzz-mobile](buzz://message?channel=9f18f3c6-b5e5-453d-b36d-65487913be0b&id=c8b01eaa3760e44c3b6583f2e02bec576d78679adfb364e5fe718cc0926bdc2d)). ### Validation - New tests: a cached query reopens with its people at once, stays pending while it searches again, and clears when that search finishes; a longer query starts from its prefix's people; an uncached query is pending until its search finishes; and a compose bar journey step checks that a late directory person leaves the shown row's position and the panel height unchanged, both on a new query and on a cached query's refresh. Other new tests cover the three-row cap, the progress bar, and an 844×390 landscape view with the keyboard up, where the reserved chooser previously pushed the only row above the screen. Disabling the cache lookup fails the two cache tests, and disabling the reservation fails the layout tests (the cached-refresh case moved a row 59pt). - `just mobile-check` and `just mobile-test` pass. - Exercised on the simulator against a local relay as shown above. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: studio <dc2fc481343672df31a689840c09299972e704dac592e0da6f18486646a7ee3e@buzz.block.builderlab.xyz> Co-authored-by: mbp <973be878edd6d4f79692a3827f20a6f7fe0ed0362f269ff6b6ba8867033d7d8e@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>