fix(tui): default Ctrl+Z to undo on Windows (#21138)

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -761,6 +761,7 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
       keybind: "terminal_suspend",
       category: "System",
       hidden: true,
+      enabled: tuiConfig.keybinds?.terminal_suspend !== "none",
       onSelect: () => {
         process.once("SIGCONT", () => {
           renderer.resume()

packages/opencode/src/cli/cmd/tui/feature-plugins/home/tips-view.tsx

@@ -148,5 +148,7 @@ const TIPS = [
   "Use {highlight}/review{/highlight} to review uncommitted changes, branches, or PRs",
   "Run {highlight}/help{/highlight} or {highlight}Ctrl+X H{/highlight} to show the help dialog",
   "Use {highlight}/rename{/highlight} to rename the current session",
-  "Press {highlight}Ctrl+Z{/highlight} to suspend the terminal and return to your shell",
+  ...(process.platform === "win32"
+    ? ["Press {highlight}Ctrl+Z{/highlight} to undo changes in your prompt"]
+    : ["Press {highlight}Ctrl+Z{/highlight} to suspend the terminal and return to your shell"]),
 ]

packages/opencode/src/config/tui.ts

@@ -111,7 +111,15 @@ export namespace TuiConfig {
       }
     }
 
-    acc.result.keybinds = Config.Keybinds.parse(acc.result.keybinds ?? {})
+    const keybinds = { ...(acc.result.keybinds ?? {}) }
+    if (process.platform === "win32") {
+      // Native Windows terminals do not support POSIX suspend, so prefer prompt undo.
+      keybinds.terminal_suspend = "none"
+      keybinds.input_undo ??= unique(["ctrl+z", ...Config.Keybinds.shape.input_undo.parse(undefined).split(",")]).join(
+        ",",
+      )
+    }
+    acc.result.keybinds = Config.Keybinds.parse(keybinds)
 
     const deps: Promise<void>[] = []
     if (acc.result.plugin?.length) {