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1/**
2 * Where the permissions chip shows, whether the mode block overflows, and which control answers
3 * the composer.mode shortcut. The model picker's footer always holds Permissions, so the chip
4 * only shows while the mode differs from the default. The rule: composer.mode has one target.
5 */
6export function resolveComposerControlsOwnership(input: {
7 /** Permissions hide while the mode is the default, or while the new-thread strip names it. */
8 readonly matchesDefault: boolean;
9 readonly collapsed: boolean;
10 /** How many trailing blocks the width measurement moved into the overflow menu. */
11 readonly measuredHiddenBlockCount: number;
12}) {
13 const accessDisplay = input.matchesDefault
14 ? ("hidden" as const)
15 : input.collapsed
16 ? ("icon" as const)
17 : ("label" as const);
18 const showModeBlock = accessDisplay !== "hidden";
19 const modeHidden = showModeBlock && input.measuredHiddenBlockCount > 0;
20 const hiddenBlockIds = modeHidden ? (["mode"] as const) : ([] as const);
21 const overflowShowsPermissions = modeHidden;
22 return {
23 accessDisplay,
24 showModeBlock,
25 hiddenBlockCount: hiddenBlockIds.length,
26 hiddenBlockIds,
27 overflowShowsPermissions,
28 /** Without a visible chip or an overflow menu holding it, the model picker answers composer.mode. */
29 pickerOwnsModeShortcut: !overflowShowsPermissions && (accessDisplay === "hidden" || modeHidden),
30 };
31}