Link to issue number:

Fixes #14975
Fixes #15184

Summary of the issue:

Sometimes the add-on store incorrectly reports "Loading add-ons" when it should report "No add-on selected".
This happens when no add-ons are found. When an add-on is found, the text is correctly replaced with the add-ons name.

When switching tabs, the add-on search filter should be reset.

Description of user facing changes

Fix bug where "No add-on selected" should be reported instead of "loading add-ons".

When switching tabs, the add-on search filter is now reset.

Description of development approach

Notify the details panel to update when the add-on list loading is complete. Previously, this would only refresh when an add-on was found.

Testing strategy:

Test STR in #14975 and #15184

Known issues with pull request:

None

Change log entries:

N/A

Code Review Checklist:

• Pull Request description:
  • description is up to date
  • change log entries
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• API is compatible with existing add-ons.
• Documentation:
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• Security precautions taken.