fix(tui): dedupe consecutive prompt history entries (#27816)

packages/opencode/src/cli/cmd/tui/component/prompt/history.tsx

@@ -27,6 +27,11 @@ export type PromptInfo = {
 
 const MAX_HISTORY_ENTRIES = 50
 
+export function isDuplicateEntry(previous: PromptInfo | undefined, next: PromptInfo): boolean {
+  if (!previous) return false
+  return JSON.stringify(previous) === JSON.stringify(next)
+}
+
 export const { use: usePromptHistory, provider: PromptHistoryProvider } = createSimpleContext({
   name: "PromptHistory",
   init: () => {
@@ -83,6 +88,10 @@ export const { use: usePromptHistory, provider: PromptHistoryProvider } = create
       },
       append(item: PromptInfo) {
         const entry = structuredClone(unwrap(item))
+        if (isDuplicateEntry(store.history.at(-1), entry)) {
+          setStore("index", 0)
+          return
+        }
         let trimmed = false
         setStore(
           produce((draft) => {