Nextcloud - Double encoding of URLs

[Lithimlin]

Describe the bug
When attempting to open a file of which the name contains a space (e.g. "cool beans.pdf"), the space will be encoded incorrectly and the file declared as missing.

This seems to be caused by a PDF.js module which is probably used in the PDF previewer

To Reproduce
Steps to reproduce the behavior:

1. Upload a file (e.g. PDF) with a name containing a space (e.g. "cool beans.pdf")
2. Attempt to open the file to receive a preview in nextcloud
3. Be greeted with an error that the file is missing

Expected behavior
The file's URL is encoded only once.
Example:
cool beans.pdf -> https://my-cloud.com/remote.php/dav/files/user/cool%20beans.pdf

Actual behavior
The file's URL is encoded twice.
Example:
cool beans.pdf -> https://my-cloud.com/remote.php/dav/files/user/cool%2520beans.pdf

Screenshots

Error message

PDF.js v2.5.207 (build: 0974d6052)
Message: Missing PDF "https://cloud-dev.emergencity.de/remote.php/dav/files/jeuler/Inter%2520test.pdf".

Desktop (please complete the following information)

• OS: ArchLinux
• Browser: Firefox
• Version: 88.0.1

[Lithimlin]

It seems this is a nexcloud bug, not a collabora one. My bad
nextcloud/files_pdfviewer#381