Extension crashes when invalid desktop files are configured & duplicate entries in app chooser

[PGupta-Git]

Bug 1: Extension crashes with invalid desktop files (Critical)
Symptom: When a desktop file configured in Flickernaut doesn't exist, the extension crashes during initialisation, preventing all context menu entries from appearing in Nautilus.

Root Cause:

• In Flickernaut/models.py line 34, Gio.DesktopAppInfo.new(app_id) returns NULL when the desktop file doesn't exist
• This causes a TypeError: constructor returned NULL exception
• The exception propagates up through manager.py and crashes the entire extension during initialisation
  Impact: Complete extension failure - no Flickernaut context menus appear in Nautilus
  Error log:
  Flickernaut CRITICAL : Fatal error in get_applications: constructor returned NULL
  Traceback (most recent call last):
  File "/home/user/.local/share/nautilus-python/extensions/Flickernaut/models.py", line 34, in init
  self.app_info = Gio.DesktopAppInfo.new(app_id) if app_id else None
  TypeError: constructor returned NULL

Bug 2: Duplicate entries in preferences app chooser

Symptom: When adding new applications in the Flickernaut preferences dialogue, applications with URL handler desktop files (like Positron, Antigravity, VS Code) appear twice in the list.

Root Cause:

• Many applications create two desktop files:
  • Main app: app.desktop
  • URL handler: app-url-handler.desktop (with NoDisplay=true)
• In prefs/application.ts, the app chooser is configured with show_all: true
• This overrides the NoDisplay=true setting and shows hidden URL handlers as duplicate entries
  Impact: Confusing UX when adding applications to Flickernaut
  Example:
• Positron appears twice: "Positron" and "Positron - URL Handler"
• Antigravity appears twice: "Antigravity" and "Antigravity - URL Handler"

Steps to Reproduce

Bug 1:

1. Configure an application in the extension and then delete the application (e.g., Install `VS-Code', configure it in the extension, uninstall VS-Code without removing the entry in the extension)
2. Restart Nautilus
3. Try to right-click in Nautilus → no Flickernaut menu entries appear

Bug 2:

1. Open Flickernaut preferences
2. Click "Add Application"
3. Observe duplicate entries for apps like Positron, Antigravity, VS Code

Environment

• GNOME version: 47+
• Nautilus version: 49.2
• Flickernaut version: 9
• OS: Fedora 43

Fix Available

A fix has been submitted in the PR that addresses both issues:

• Adds error handling to gracefully skip invalid desktop files
• Changes app chooser to respect NoDisplay=true setting

[imoize]

i'll look your PR soon

[PGupta-Git]

Please let me know your thoughts. Loved the project.