fix(app): model selection persist by session (#17348)

packages/app/src/components/prompt-input/submit.test.ts

@@ -17,6 +17,7 @@ const optimistic: Array<{
 }> = []
 const optimisticSeeded: boolean[] = []
 const storedSessions: Record<string, Array<{ id: string; title?: string }>> = {}
+const promoted: Array<{ directory: string; sessionID: string }> = []
 const sentShell: string[] = []
 const syncedDirectories: string[] = []
 
@@ -86,6 +87,11 @@ beforeAll(async () => {
       agent: {
         current: () => ({ name: "agent" }),
       },
+      session: {
+        promote(directory: string, sessionID: string) {
+          promoted.push({ directory, sessionID })
+        },
+      },
     }),
   }))
 
@@ -201,6 +207,7 @@ beforeEach(() => {
   enabledAutoAccept.length = 0
   optimistic.length = 0
   optimisticSeeded.length = 0
+  promoted.length = 0
   params = {}
   sentShell.length = 0
   syncedDirectories.length = 0
@@ -240,6 +247,11 @@ describe("prompt submit worktree selection", () => {
     expect(createdSessions).toEqual(["/repo/worktree-a", "/repo/worktree-b"])
     expect(sentShell).toEqual(["/repo/worktree-a", "/repo/worktree-b"])
     expect(syncedDirectories).toEqual(["/repo/worktree-a", "/repo/worktree-a", "/repo/worktree-b", "/repo/worktree-b"])
+    expect(promoted).toEqual([
+      { directory: "/repo/worktree-a", sessionID: "session-1" },
+      { directory: "/repo/worktree-b", sessionID: "session-2" },
+    ])
+    expect(syncedDirectories).toEqual(["/repo/worktree-a", "/repo/worktree-a", "/repo/worktree-b", "/repo/worktree-b"])
   })
 
   test("applies auto-accept to newly created sessions", async () => {

packages/app/src/components/prompt-input/submit.ts

@@ -296,6 +296,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
 
     const currentModel = local.model.current()
     const currentAgent = local.agent.current()
+    const variant = local.model.variant.current()
     if (!currentModel || !currentAgent) {
       showToast({
         title: language.t("prompt.toast.modelAgentRequired.title"),
@@ -370,6 +371,7 @@ export function createPromptSubmit(input: PromptSubmitInput) {
         seed(sessionDirectory, created)
         session = created
         if (shouldAutoAccept) permission.enableAutoAccept(session.id, sessionDirectory)
+        local.session.promote(sessionDirectory, session.id)
         layout.handoff.setTabs(base64Encode(sessionDirectory), session.id)
         navigate(`/${base64Encode(sessionDirectory)}/session/${session.id}`)
       }
@@ -387,7 +389,6 @@ export function createPromptSubmit(input: PromptSubmitInput) {
       providerID: currentModel.provider.id,
     }
     const agent = currentAgent.name
-    const variant = local.model.variant.current()
     const context = prompt.context.items().slice()
     const draft: FollowupDraft = {
       sessionID: session.id,