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Crash passing in .md file path #38

@audreyfeldroy

Description

@audreyfeldroy

What happens now

Pad crashed when I tried to open a .md file:

air % pad ~/docs/air-static/zero-config-roadmap.md.
╭────────────────────────────────── Traceback (most recent call last) ───────────────────────────────────╮
│ /Users/arg/.local/share/uv/tools/pad/lib/python3.14/site-packages/pad/app.py:1020 in                   │
│ on_directory_tree_file_selected                                                                        │
│                                                                                                        │
│   1017 │   def on_directory_tree_file_selected(                                                        │
│   1018 │   │   self, event: DirectoryTree.FileSelected                                                 │
│   1019 │   ) -> None:                                                                                  │
│ ❱ 1020 │   │   self.dismiss(event.path)                                                                │
│   1021 │                                                                                               │
│   1022 │   def action_cancel(self) -> None:                                                            │
│   1023 │   │   self.dismiss(None)                                                                      │
│                                                                                                        │
│ ╭────────── locals ──────────╮                                                                         │
│ │ event = FileSelected()     │                                                                         │
│ │  self = FileBrowserModal() │                                                                         │
│ ╰────────────────────────────╯                                                                         │
│                                                                                                        │
│ /Users/arg/.local/share/uv/tools/pad/lib/python3.14/site-packages/textual/app.py:3032 in pop_screen    │
│                                                                                                        │
│   3029 │   │                                                                                           │
│   3030 │   │   screen_stack = self._screen_stack                                                       │
│   3031 │   │   if len(screen_stack) <= 1:                                                              │
│ ❱ 3032 │   │   │   raise ScreenStackError(                                                             │
│   3033 │   │   │   │   "Can't pop screen; there must be at least one screen on the stack"              │
│   3034 │   │   │   )                                                                                   │
│   3035                                                                                                 │
│                                                                                                        │
│ ╭─────────────────────────────────────────── locals ───────────────────────────────────────────╮       │
│ │ screen_stack = [Screen(id='_default')]                                                       │       │
│ │         self = PadApp(title='Pad', classes={'-dark-mode'}, pseudo_classes={'focus', 'dark'}) │       │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯       │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────╯
ScreenStackError: Can't pop screen; there must be at least one screen on the stack

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