Breadcrumb navigation broken

[kulmann]

The breadcrumb navigation seems to be broken.

Steps to reproduce

1. Create a folder hierarchy A/B/C/D
2. Navigate into folder D
3. Try to navigate into one of the folders up the hierarchy, let's pick C

Expected behaviour

Navigation into C is successful and I can see folder contents of C

Actual behaviour

• Breadcrumbs stay the same (Home / A / B / C / D) although I clicked on C
• No folder contents visible. Instead I see a loading spinner.

browser logs

The JS console shows that the propfind contains an encoded path, thus the propfind fails:
PROPFIND http://host.docker.internal/px1/remote.php/webdav/A%252FB%252FC 404 (Not Found)

There is another, probably unrelated, error in the JS console:

owncloud.js?4716:1 Uncaught (in promise) TypeError: Cannot read property 'data' of undefined
    at eval (owncloud.js?4716:1)

Screenshot

Bonus points for adding tests to avoid this in the future. ;-)

[VP-]

In 0.6.0 I get the spinner when clicking on the current folder in the breadcrumb.
The file picker attempts a request to webdav/null, which results in a 404.

But at least clicking on another folder gets it working again.

[kulmann]

cc @LukasHirt