launcher-menu: showAllApps lists all programs without Developer Mode

Without Steam's Developer Mode the "+" menu hides konsole, systemsettings,
dolphin, plasma-discover, vlc and a few more by executable name. The patch
empties only that list's iterator, leaving the setting itself untouched.

modules/launcher-menu/show-all/patch.js

@@ -0,0 +1,42 @@
+// launcher-menu show-all: the VR dashboard's "+" menu lists all programs
+// without Steam's Developer Mode.
+// Steam filters the programs of ScanForInstalledNonSteamApps() by the base
+// name of their executable: some are always hidden (steam, vrurlhandler),
+// and without Developer Mode (client setting developer_mode_enabled) also a
+// second list: firewall-config, vlc, dolphin, cmake-gui, plasma-discover,
+// konsole, systemsettings, qrenderdoc, sh, lxterminal. The menu's filter
+// spreads that list into its block list only when Developer Mode is off
+// (`bDevMode || block.push(...devModeOnly)`), and nothing else uses it.
+//
+// This file is a function expression, called by the file lib/default.nix
+// (mkPatch) generates: (<this file>)(find, sigs), with find the finder
+// library (lib/finders.js) and sigs this patch's module signatures
+// (lib/signatures.json, "launcher-menu-show-all": the module exporting the
+// list, plus a check-only anchor for the filter). No options.
+//
+// The patch gives that one array an own, empty Symbol.iterator, so spreading
+// it adds nothing; its contents stay as they are (the signature keeps
+// matching on re-injection) and the Developer Mode setting itself, used
+// elsewhere (settings pages, controller pairing, ...), is not touched. The
+// menu re-filters whenever it rescans, i.e. on every open. The array is
+// remembered as window.__sfuiShowAllApps for unpatch.js. Idempotent.
+((find, sigs) => {
+  const VERSION = 1;
+  let mods;
+  try {
+    mods = find.resolveAll(find.getWebpackRequire('webpackChunksteamui'), sigs);
+  } catch (e) {
+    return `signature not found, Steam left unpatched: ${e.message}`;
+  }
+  const list = mods.devModeApps.exports.devModeOnly;
+  if (!Array.isArray(list)) return 'Developer Mode app list is not an array, Steam left unpatched';
+  const prev = window.__sfuiShowAllApps;
+  if (prev && prev.list === list && prev.version === VERSION &&
+      Object.prototype.hasOwnProperty.call(list, Symbol.iterator)) return 'unchanged';
+  Object.defineProperty(list, Symbol.iterator, {
+    configurable: true, writable: true, enumerable: false,
+    value: function* sfuiShowAllApps() {},
+  });
+  window.__sfuiShowAllApps = { version: VERSION, list };
+  return `patched (no longer hidden: ${Array.prototype.join.call(list, ', ')})`;
+})