fix: restore prompt focus after footer selection (#20841)

packages/app/e2e/prompt/prompt-footer-focus.spec.ts

@@ -0,0 +1,88 @@
+import type { Locator, Page } from "@playwright/test"
+import { test, expect } from "../fixtures"
+import { promptAgentSelector, promptModelSelector, promptSelector } from "../selectors"
+
+type Probe = {
+  agent?: string
+  model?: { providerID: string; modelID: string; name?: string }
+  models?: Array<{ providerID: string; modelID: string; name: string }>
+  agents?: Array<{ name: string }>
+}
+
+async function probe(page: Page): Promise<Probe | null> {
+  return page.evaluate(() => {
+    const win = window as Window & {
+      __opencode_e2e?: {
+        model?: {
+          current?: Probe
+        }
+      }
+    }
+    return win.__opencode_e2e?.model?.current ?? null
+  })
+}
+
+async function state(page: Page) {
+  const value = await probe(page)
+  if (!value) throw new Error("Failed to resolve model selection probe")
+  return value
+}
+
+async function ready(page: Page) {
+  const prompt = page.locator(promptSelector)
+  await prompt.click()
+  await expect(prompt).toBeFocused()
+  await prompt.pressSequentially("focus")
+  return prompt
+}
+
+async function body(prompt: Locator) {
+  return prompt.evaluate((el) => (el as HTMLElement).innerText)
+}
+
+test("agent select returns focus to the prompt", async ({ page, gotoSession }) => {
+  await gotoSession()
+
+  const prompt = await ready(page)
+
+  const info = await state(page)
+  const next = info.agents?.map((item) => item.name).find((name) => name !== info.agent)
+  test.skip(!next, "only one agent available")
+  if (!next) return
+
+  await page.locator(`${promptAgentSelector} [data-slot="select-select-trigger"]`).first().click()
+
+  const item = page.locator('[data-slot="select-select-item"]').filter({ hasText: next }).first()
+  await expect(item).toBeVisible()
+  await item.click({ force: true })
+
+  await expect(page.locator(`${promptAgentSelector} [data-slot="select-select-trigger-value"]`).first()).toHaveText(
+    next,
+  )
+  await expect(prompt).toBeFocused()
+  await prompt.pressSequentially(" agent")
+  await expect.poll(() => body(prompt)).toContain("focus agent")
+})
+
+test("model select returns focus to the prompt", async ({ page, gotoSession }) => {
+  await gotoSession()
+
+  const prompt = await ready(page)
+
+  const info = await state(page)
+  const key = info.model ? `${info.model.providerID}:${info.model.modelID}` : null
+  const next = info.models?.find((item) => `${item.providerID}:${item.modelID}` !== key)
+  test.skip(!next, "only one model available")
+  if (!next) return
+
+  await page.locator(`${promptModelSelector} [data-action="prompt-model"]`).first().click()
+
+  const item = page.locator(`[data-slot="list-item"][data-key="${next.providerID}:${next.modelID}"]`).first()
+  await expect(item).toBeVisible()
+  await item.click({ force: true })
+
+  await expect(page.locator(`${promptModelSelector} [data-action="prompt-model"] span`).first()).toHaveText(next.name)
+  await expect(prompt).toBeFocused()
+  await prompt.pressSequentially(" model")
+  await expect.poll(() => body(prompt)).toContain("focus model")
+})