Fix reloading UI on updates and restarting steam (#303)

frontend/src/steamfixes/README.md

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+## What's this?
+
+`steamfixes` contains various fixes and workaround for things Valve has broken that cause Decky issues.
+
+## Current fixes:
+
+- StartRestart() -> StartShutdown(false) override:
+
+  StartRestart() breaks CEF debugging, StartShutdown(false) doesn't. We can safely replace StartRestart() with StartShutdown(false) as gamescope-session will automatically restart the steam client anyway if it shuts down, bypassing the broken restart codepath. Added 12/29/2022
+
+- ExecuteSteamURL UI reload fix:
+
+  Starting sometime in November 2022, Valve broke reloading the Steam UI pages via location.reload, as it won't properly start the UI. We can manually trigger UI startup if we detect no active input contexts by calling `SteamClient.URL.ExecuteSteamURL("steam://open/settings/")` Added 12/29/2022

frontend/src/steamfixes/index.ts

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+import reloadFix from './reload';
+import restartFix from './restart';
+let fixes: Function[] = [];
+
+export function deinitSteamFixes() {
+  fixes.forEach((deinit) => deinit());
+}
+
+export async function initSteamFixes() {
+  fixes.push(reloadFix());
+  fixes.push(await restartFix());
+}

frontend/src/steamfixes/reload.ts

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+import Logger from '../logger';
+
+const logger = new Logger('ReloadSteamFix');
+
+export default function reloadFix() {
+  // Hack to unbreak the ui when reloading it
+  if (window.FocusNavController?.m_rgAllContexts?.length == 0) {
+    SteamClient.URL.ExecuteSteamURL('steam://open/settings');
+    logger.log('Applied UI reload fix.');
+  }
+
+  // This steamfix does not need to deinit.
+  return () => {};
+}

frontend/src/steamfixes/restart.ts

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+import { Patch, findModuleChild, replacePatch, sleep } from 'decky-frontend-lib';
+
+import Logger from '../logger';
+
+const logger = new Logger('RestartSteamFix');
+
+declare global {
+  interface Window {
+    SteamClient: any;
+    appDetailsStore: any;
+  }
+}
+
+let patch: Patch;
+
+function rePatch() {
+  // If you patch anything on SteamClient within the first few seconds of the client having loaded it will get redefined for some reason, so repatch any of these changes that occur with History.listen or an interval
+  patch = replacePatch(window.SteamClient.User, 'StartRestart', () => SteamClient.User.StartShutdown(false));
+}
+
+export default async function restartFix() {
+  try {
+    rePatch();
+    // TODO type and add to frontend-lib
+    let History: any;
+
+    while (!History) {
+      History = findModuleChild((m) => {
+        if (typeof m !== 'object') return undefined;
+        for (let prop in m) {
+          if (m[prop]?.m_history) return m[prop].m_history;
+        }
+      });
+      if (!History) {
+        logger.debug('Waiting 5s for history to become available.');
+        await sleep(5000);
+      }
+    }
+
+    function repatchIfNeeded() {
+      if (window.SteamClient.User.StartRestart !== patch.patchedFunction) {
+        rePatch();
+      }
+    }
+
+    const unlisten = History.listen(repatchIfNeeded);
+
+    // Just in case
+    setTimeout(repatchIfNeeded, 5000);
+    setTimeout(repatchIfNeeded, 10000);
+
+    return () => {
+      unlisten();
+      patch.unpatch();
+    };
+  } catch (e) {
+    logger.error('Error patching StartRestart', e);
+  }
+  return () => {};
+}