tui: PageUp/PageDown dismiss the /btw answer dialog instead of scrolling #59612

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1. opencode-agent commented on Oct 27, 2026

   

   opencode-agentBot

   on Oct 27, 2026 – with OpenCode Agent

   Contributor

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   Thanks for the detailed report. I reproduced this on 2.1.4 and it still happens on the latest dev (8697644).

   What I did: open a session, run /btw with a question whose answer is longer than the dialog, then press a key.

   • j: the answer scrolls and the dialog stays open.
   • PageDown, PageUp and ctrl+alt+f: the dialog closes right away and the answer is gone.

   The recording and screenshots below show this, and the script below reproduces it.

   From the code, the cause appears to be that the session-wide session.page.up / session.page.down bindings still run while the /btw dialog is open, and their handler closes any open dialog, so the dialog's own page-scroll handling never takes effect. Your workaround (setting those bindings to none in cli.json) fits that. Related: #50879 (a /btw answer can't be recovered once its dialog closes), which is why this loses the answer.

   recording.mp4

   

   

   Reproduction script (drive.ts)

   // Reproduces anomalyco/opencode#59612: PageUp/PageDown close the /btw answer dialog
   // instead of scrolling it.
   import { Effect, Stream } from "effect"
   import { Llm, OpenCodeDriver } from "opencode-drive"
   
   const numbers = Array.from({ length: 60 }, (_, i) => `line ${i + 1}`).join("\n")
   
   type Oc = Parameters<Parameters<typeof OpenCodeDriver.use>[1]>[0]
   const ask = (ui: Oc["ui"], llm: Oc["llm"], label: string) =>
     Effect.gen(function* () {
       yield* ui.submit("/btw Output the integers from 1 to 60")
       yield* ui.waitFor(() => dialogOpen(ui).pipe(Effect.orDie), { timeout: 20000 })
       yield* Effect.sleep(800)
       yield* ui.screenshot(`${label}-dialog-open`)
     })
   
   const screenText = (ui: Oc["ui"]) =>
     ui.capture().pipe(
       Effect.map((f) => f.lines.map((l) => l.spans.map((s) => s.text).join("")).join("\n")),
     )
   // the /btw dialog is open when its header is on screen
   const dialogOpen = (ui: Oc["ui"]) =>
     screenText(ui).pipe(Effect.map((t) => t.includes("/btw  Output the integers")))
   
   export default OpenCodeDriver.use(
     {
       ...(process.env.OC_DEV ? { opencode: { dev: process.env.OC_DEV } } : {}),
       tui: { recording: true, keypressOverlay: true, viewport: { cols: 120, rows: 34 } },
     },
     ({ ui, llm }) =>
       Effect.gen(function* () {
         // establish a session first
         // simulated model: /btw questions get a 60-line answer, anything else a short reply
         yield* llm.serve((request) =>
           Stream.make(
             JSON.stringify(request).includes("integers from 1 to 60")
               ? Llm.text(numbers)
               : Llm.text("Hello from the main session."),
           ),
         )
         yield* ui.submit("hi")
         yield* ui.waitFor(() => screenText(ui).pipe(Effect.orDie, Effect.map((t) => t.includes("Build · Simulated Model ·"))), { timeout: 20000 })
   
         // control: j scrolls and keeps dialog open
         yield* ask(ui, llm, "a")
         for (let i = 0; i < 5; i++) yield* ui.press("j")
         yield* Effect.sleep(500)
         yield* ui.screenshot("a-after-j")
         yield* Effect.log(`after j, dialog open: ${yield* dialogOpen(ui)}`)
         yield* ui.press("escape")
         yield* Effect.sleep(800)
   
         // PageDown
         yield* ask(ui, llm, "b")
         // the simulated input has no named PageDown key, so send its terminal sequence (CSI 6 ~)
         yield* ui.press("\x1b[6~")
         yield* Effect.sleep(800)
         yield* ui.screenshot("b-after-pagedown")
         yield* Effect.log(`after pagedown, dialog open: ${yield* dialogOpen(ui)}`)
         if (yield* dialogOpen(ui)) yield* ui.press("escape")
         yield* Effect.sleep(800)
   
         // PageUp (CSI 5 ~)
         yield* ask(ui, llm, "b2")
         yield* ui.press("\x1b[5~")
         yield* Effect.sleep(800)
         yield* ui.screenshot("b2-after-pageup")
         yield* Effect.log(`after pageup, dialog open: ${yield* dialogOpen(ui)}`)
         if (yield* dialogOpen(ui)) yield* ui.press("escape")
         yield* Effect.sleep(800)
   
         // ctrl+alt+f
         yield* ask(ui, llm, "c")
         yield* ui.press("f", { ctrl: true, meta: true })
         yield* Effect.sleep(800)
         yield* ui.screenshot("c-after-ctrl-alt-f")
         yield* Effect.log(`after ctrl+alt+f, dialog open: ${yield* dialogOpen(ui)}`)
       }),
   )

   Run it with opencode-drive: opencode-drive run ./drive.ts. It drives opencode from your PATH; set OC_DEV to the path of an OpenCode checkout to run that from source instead.
2. opencode-agent

   added

   reproduced

   on Oct 27, 2026
3. Aafimalek commented on Oct 27, 2026

   

   Aafimalek

   on Oct 27, 2026

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   I reproduced the Page Down dismissal on Windows against dev using the TUI test renderer. I'd like to work on a focused fix and regression test. Could a maintainer assign this to me?