Fix missing parts of #1603

[j0hannesr0th]

Topic and Scope

Fix the problems described here: #1603 (comment)

See it here:

Screencast.from.30.06.2023.23.38.52.webm

Concerns/issues

@christianlupus what do you think about fraction handling like this?

I did some research and found this: https://github.com/infusion/Fraction.js/

I'm not sure if you want some 3rd party lib just for fraction handling.

Formal requirements

There are some formal requirements that should be satisfied. Please mark those by checking the corresponding box.

• I did check that the app can still be opened and does not throw any browser logs
• I created tests for newly added PHP code (check this if no PHP changes were made)
• I updated the OpenAPI specs and added an entry to the API changelog (check if API was not modified)
• I notified the matrix channel if I introduced an API change

[github-actions]

Test Results

     27 files  1 233 suites   7m 59s ⏱️
   498 tests    498 ✔️ 0 💤 0 ❌
4 482 runs  4 481 ✔️ 1 💤 0 ❌

Results for commit 35dfb31.

♻️ This comment has been updated with latest results.

[christianlupus]

This was superseded by #1765