fix(app): suspend hidden terminal renderer (#33990)

Co-authored-by: Test <test@opencode.test>

packages/app/e2e/regression/terminal-hidden.spec.ts

@@ -0,0 +1,79 @@
+import { expect, test } from "@playwright/test"
+import { mockOpenCodeServer } from "../utils/mock-server"
+import { expectSessionTitle } from "../utils/waits"
+
+const directory = "C:/OpenCode/HiddenTerminalRegression"
+const projectID = "proj_hidden_terminal_regression"
+const sessionID = "ses_hidden_terminal_regression"
+const title = "Hidden terminal regression"
+
+test("unmounts the terminal renderer while the pane is hidden", async ({ page }) => {
+  await page.setViewportSize({ width: 1400, height: 900 })
+  await mockOpenCodeServer(page, {
+    directory,
+    project: {
+      id: projectID,
+      worktree: directory,
+      vcs: "git",
+      name: "hidden-terminal-regression",
+      time: { created: 1700000000000, updated: 1700000000000 },
+      sandboxes: [],
+    },
+    provider: {
+      all: [
+        {
+          id: "opencode",
+          name: "OpenCode",
+          models: { test: { id: "test", name: "Test", limit: { context: 200_000 } } },
+        },
+      ],
+      connected: ["opencode"],
+      default: { providerID: "opencode", modelID: "test" },
+    },
+    sessions: [
+      {
+        id: sessionID,
+        slug: "hidden-terminal-regression",
+        projectID,
+        directory,
+        title,
+        version: "dev",
+        time: { created: 1700000000000, updated: 1700000000000 },
+      },
+    ],
+    pageMessages: () => ({ items: [] }),
+  })
+  await page.route("**/pty", (route) =>
+    route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify({ id: "pty_hidden_terminal", title: "Terminal 1" }),
+    }),
+  )
+  await page.route("**/pty/pty_hidden_terminal", (route) =>
+    route.fulfill({ status: 200, contentType: "application/json", body: "{}" }),
+  )
+  await page.routeWebSocket("**/pty/pty_hidden_terminal/connect", () => undefined)
+
+  await page.goto(`/${base64Encode(directory)}/session/${sessionID}`)
+  await expectSessionTitle(page, title)
+
+  await page.keyboard.press("Control+Backquote")
+  const panel = page.locator("#terminal-panel")
+  await expect(panel).toHaveAttribute("aria-hidden", "false")
+  await expect(page.locator('[data-component="terminal"]')).toBeVisible()
+
+  await page.keyboard.press("Control+Backquote")
+  await expect(panel).toHaveAttribute("aria-hidden", "true")
+  await expect(page.locator('[data-component="terminal"]')).toHaveCount(0)
+
+  await page.setViewportSize({ width: 1200, height: 700 })
+  await expect(page.locator('[data-component="terminal"]')).toHaveCount(0)
+
+  await page.keyboard.press("Control+Backquote")
+  await expect(page.locator('[data-component="terminal"]')).toBeVisible()
+})
+
+function base64Encode(value: string) {
+  return Buffer.from(value, "utf8").toString("base64").replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "")
+}

packages/app/src/pages/session/terminal-panel.tsx

@@ -293,7 +293,7 @@ export function TerminalPanel() {
                 </Tabs.List>
               </Tabs>
               <div class="flex-1 min-h-0 relative">
-                <Show when={terminal.active()} keyed>
+                <Show when={opened() && terminal.active()} keyed>
                   {(id) => {
                     const ops = terminal.bind()
                     return (