[Bug]: Calendar tries to import directory if it ends with .ical

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

When trying to import an ics file located in a directory whose name ends in .ical, the file picker does not allow me to select a file inside the directory, but gives me an "open" option for the directory itself. Pressing "open" does results in the file picker to close but no import is initiated.

Steps to reproduce

1. Place an ics file (e.g. file.ics) in a directory whose name ends in .ical (e.g. dir.ical).
2. In Nextcloud, go to Calendar => Calendar settings => Import calendar
3. Try selecting file.ics in dir.ical and note that the contents of dir.ical are not displayed, but an "open" option is displayed for the directory itself.
4. Press Open and note that the file picker disappears, but no import is initiated.

Expected behavior

file.ics should be selectable within dir.ical.

Nextcloud Server version

29

Operating system

Other

PHP engine version

None

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Firefox 133 on MacOS 12.7.6
nextcloud:29-fpm-alpine from dockerhub

Start at Calendar settings > Import calendar and reproduce the issue with an .ics file inside a directory ending in .ical. Trace the file picker behavior for that directory and verify that file.ics becomes selectable and the import starts when Open is used.