Fix UE launch permission, move it to context menu, refresh History after Submit

- Launch now goes through a backend launch_file command (shell `start`), so
  it works for any path — fixes "Not allowed to open path" from the opener
  plugin's scoped open-path.
- Removed the toolbar Launch-Unreal button; it's now a right-click item on the
  Working folder ("Launch Unreal Engine"), shown only when a .uproject exists.
- Reload History after a successful Submit so the new changelist shows without
  a manual F5.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src-tauri/src/lib.rs

@@ -610,6 +610,25 @@ async fn open_in_explorer(state: State<'_, AppState>, target: String) -> Result<
     Ok(())
 }
 
+/// Open a local file with its associated application (e.g. launch Unreal for a
+/// `.uproject`). Uses the shell `start` so there are no path-scope restrictions.
+#[tauri::command]
+async fn launch_file(path: String) -> Result<(), String> {
+    if !std::path::Path::new(&path).exists() {
+        return Err(format!("File not found: {path}"));
+    }
+    let mut c = Command::new("cmd");
+    #[cfg(windows)]
+    {
+        use std::os::windows::process::CommandExt;
+        c.creation_flags(0x0800_0000);
+    }
+    c.args(["/C", "start", "", &path])
+        .spawn()
+        .map_err(|e| format!("Could not launch: {e}"))?;
+    Ok(())
+}
+
 /// Look for an Unreal `.uproject` inside the working-folder scope (resolved to a
 /// local dir via `p4 where`). Checks the folder itself and one level of subdirs.
 /// Returns the local path of the first match, or "" if the scope isn't a UE project.
@@ -751,6 +770,7 @@ pub fn run() {
             p4_undo_change,
             open_in_explorer,
             find_uproject,
+            launch_file,
             p4_describe,
             read_file,
             read_depot,

src/App.tsx

@@ -3,7 +3,6 @@ import type { MouseEvent as ReactMouseEvent, CSSProperties, ReactNode } from "re
 import { getCurrentWindow } from "@tauri-apps/api/window";
 import { getCurrentWebview } from "@tauri-apps/api/webview";
 import { listen } from "@tauri-apps/api/event";
-import { openPath } from "@tauri-apps/plugin-opener";
 import ModelViewer from "./ModelViewer";
 import UpdateBanner from "./Updater";
 import "./App.css";
@@ -504,7 +503,7 @@ function Workbench({ info, session, light, toggleTheme, lang, setLang, zoom, set
   // launch Unreal by opening the detected .uproject (file association starts UE)
   async function launchUE() {
     if (!uproject) return;
-    try { await openPath(uproject); flash(t("Launching Unreal…")); }
+    try { await p4.launchFile(uproject); flash(t("Launching Unreal…")); }
     catch (e) { flash(String(e), true); }
   }
 
@@ -564,6 +563,7 @@ function Workbench({ info, session, light, toggleTheme, lang, setLang, zoom, set
     if (errors.length) flash(errors.join(" · "), true);
     else flash(t("Sent to the server: {n} changelist(s).", { n }));
     await refresh();
+    await loadHistory(); // the submit created a new submitted changelist — refresh History
   }
 
   async function doRevert(file: OpenedFile) {
@@ -638,6 +638,7 @@ function Workbench({ info, session, light, toggleTheme, lang, setLang, zoom, set
         <div className="vhandle grouph" onMouseDown={(e) => startResize(e, "sync")} title={t("Drag to resize")} />
         <div className="tzone" onClick={() => browseTo("")} title={t("Choose the project working folder · right-click for more")}
           onContextMenu={(e) => openCtx(e, [
+            ...(uproject ? [{ label: t("Launch Unreal Engine"), act: launchUE }] : []),
             { label: t("Open in Explorer"), act: () => reveal(activePath || String(info?.clientRoot || "")) },
             { label: t("Choose another folder…"), act: () => browseTo("") },
             { label: t("Copy path"), act: () => copyText(activePath || "//…", t("Path")) },
@@ -646,12 +647,6 @@ function Workbench({ info, session, light, toggleTheme, lang, setLang, zoom, set
           <span className="tzmeta"><span className="lbl">{t("Working folder")}</span><span className="val">{activePath || t("whole workspace (//…)")}</span></span>
           <span className="chev">{I.chev}</span>
         </div>
-        {uproject && (
-          <button className="ue-btn" onClick={launchUE} title={t("Open this project in Unreal Engine")}>
-            <span className="ue-ic">{I.ue}</span>
-            <span className="ue-lbl"><span className="ue-a">{t("Launch")}</span><span className="ue-b">Unreal</span></span>
-          </button>
-        )}
         {pending.length > 0 ? (
           <div className="tzone push" onClick={pushAll} title={t("Submit committed to the server (push)")}>
             <span className="ic"><svg viewBox="0 0 24 24" fill="none"><path d="M12 20V8M6 14l6-6 6 6" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round" /></svg></span>

src/i18n.ts

@@ -68,6 +68,7 @@ const D: Record<string, Tr> = {
   "Working…": { ru: "Работаю…", de: "Arbeite…", fr: "En cours…", es: "Trabajando…" },
   "pull from server": { ru: "забрать с сервера (pull)", de: "vom Server holen (pull)", fr: "récupérer du serveur (pull)", es: "traer del servidor (pull)" },
   "Launch": { ru: "Запустить", de: "Starten", fr: "Lancer", es: "Iniciar" },
+  "Launch Unreal Engine": { ru: "Запустить Unreal Engine", de: "Unreal Engine starten", fr: "Lancer Unreal Engine", es: "Iniciar Unreal Engine" },
   "Open this project in Unreal Engine": { ru: "Открыть проект в Unreal Engine", de: "Projekt in Unreal Engine öffnen", fr: "Ouvrir le projet dans Unreal Engine", es: "Abrir el proyecto en Unreal Engine" },
   "Launching Unreal…": { ru: "Запуск Unreal…", de: "Unreal wird gestartet…", fr: "Lancement d’Unreal…", es: "Iniciando Unreal…" },
 

src/p4.ts

@@ -73,6 +73,7 @@ export const p4 = {
   undoChange: (change: string) => invoke<string>("p4_undo_change", { change }),
   openInExplorer: (target: string) => invoke<void>("open_in_explorer", { target }),
   findUproject: (scope: string) => invoke<string>("find_uproject", { scope }),
+  launchFile: (path: string) => invoke<void>("launch_file", { path }),
   readDepot: async (depot: string): Promise<ArrayBuffer> => {
     const r: unknown = await invoke("read_depot", { depot });
     if (r instanceof ArrayBuffer) return r;