- BrowserPreview keeps a ScrollHandle for its strip and a tracked focus
handle per thumbnail; the focused thumbnail scrolls into view once, through
forms::options::reveal and the canvas now shared as revealer
- Popup draws its reveal through the same revealer
- test tab_brings_a_hidden_frame_into_view
- Select, Combobox and MultiSelect opened a long list at its top, the
choice out of view: gpui skips a scroll asked before the list's first
frame. Picker and Suggestions share forms::options::reveal, which Popup
runs from a canvas inside the list
- test: a_long_list_opens_with_its_choice_in_view
- AGENTS: the scroll rule names the reveal
- a trigger opens only its word, so a path keeps its slashes in the query
- suggestions reveal the cursor once the list has its bounds: Popup takes a
row to reveal, and a canvas inside the list asks for it and one more frame
ZacharyZhang-NY