fix: let A go deeper from home or a drive root

With no usual folder the browser opened at HOME on Use this folder, and A pressed through the screens installed the BIOS files into ~. At HOME or a drive's root A now opens the first folder. Picking the old card to copy from is unchanged.

install.ps1

@@ -11,7 +11,7 @@
 
     $ErrorActionPreference = "Stop"
     $defaultInstallUrl = "https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-    $defaultInstallSha256 = "04070f071adf988291854cf4ad8fb6e7a34f8044cfbcb710ba660863c2c6b19e"
+    $defaultInstallSha256 = "23f334efb9e37ba1c2542b8599db7af6e67dfd5e0061d39cb507765f2594bd45"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }

install.py

@@ -10924,6 +10924,12 @@ def _browse_to(state: TuiState, folder: Path | None, came_from: Path | None = No
     state.browse_dir = folder
     state.browse_rows, state.status = _browse_rows(folder, state.browse_for == "from")
     focus = 0
+    if (folder is not None and state.browse_for != "from"
+            and folder in (state.home, Path(folder.anchor))):
+        # No frontend reads its BIOS files from HOME or a drive's root: A
+        # pressed through the screens installed into ~. A goes deeper there.
+        focus = next((index for index, row in enumerate(state.browse_rows)
+                      if row.action == "dir" and row.value != folder.parent), 0)
     for index, row in enumerate(state.browse_rows):
         if came_from is not None and row.action == "dir" and row.value == came_from:
             focus = index

install.sh

@@ -18,7 +18,7 @@ esac
 TEMP_INSTALLER=""
 TEMP_DIRECTORY=""
 DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-DEFAULT_INSTALL_SHA256="04070f071adf988291854cf4ad8fb6e7a34f8044cfbcb710ba660863c2c6b19e"
+DEFAULT_INSTALL_SHA256="23f334efb9e37ba1c2542b8599db7af6e67dfd5e0061d39cb507765f2594bd45"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {

tests/test_install_tui.py

@@ -642,6 +642,26 @@ class Flow(unittest.TestCase):
         self.assertEqual(effects, [("fetch", "retroarch")])
         self.assertEqual(state.dest, root)
 
+    def test_a_holds_no_bios_folder_root_never_takes_a(self):
+        """With no usual folder the browser opens at HOME, on Use this
+        folder: A five times installed the BIOS files into ~. At HOME or a
+        drive's root, A goes into the first folder instead."""
+        home = Path(tempfile.mkdtemp(dir=REPO_ROOT / "tmp"))
+        self.addCleanup(shutil.rmtree, home, True)
+        (home / "Games").mkdir()
+        state = install.TuiState(os_type="linux", home=home)
+        state.platform = "retroarch"
+        state.stack = ["folder"]
+        state.folder_default = None
+        with mock.patch.object(install, "_mounted_cards", return_value=[]):
+            install._browse_to(state, home)
+            self.assertEqual(state.browse_rows[state.focus["browse"]].label, "Games/")
+            install._browse_to(state, home / "Games")
+            self.assertEqual(state.browse_rows[state.focus["browse"]].label,
+                             "Use this folder")
+            install._browse_to(state, Path(home.anchor))
+            self.assertNotEqual(state.browse_rows[state.focus["browse"]].action, "use")
+
     def test_cards_are_listed_first(self):
         card = Path(tempfile.mkdtemp(dir=REPO_ROOT / "tmp"))
         self.addCleanup(shutil.rmtree, card, True)