DropDown List Jerkiness/Jumps

[ypatios]

Actual Behaviour:
Dropdown menu repopulates, scroll position resets to top, causing jerkiness/jumps.

Expected Behaviour:
Open menu retains scroll position during background refreshes.

Steps to Reproduce (eg for Workflow DropDown):

1. Open event upload or bulk action dialog.
2. Open workflow dropdown (effect is stronger with long lists).
3. Scroll down in the open dropdown.
4. Wait for Admin UI table polling refresh (default 5'')

Screen.Recording.2026-02-06.at.12.57.32.mp4

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Possible Cause:
DropDown component uses AsyncSelect for static options; defaultOptions and loadOptions create new references on every parent render, triggering menu reload.

Suggested Fix:
Use synchronous Select for local options (!fetchOptions), memoize formatted options with useMemo, stabilize loadOptions with useCallback.

[marcusm7]

Hi,

• I can't reproduce it in 17.8. Select Workflow Dropdown opened -> last entry selected. Everything as expected
• On https://stable.opencast.org (OC19) I can observe the described misbehaviour (with Firefox 147.0.3 in wayland).

[ypatios]

after reading this –which might even be related–, I made a little demo screen rec and added it to the description above.

[mwuttke]

I think I can reproduce this behaviour in our test system. We are using OC 19.3.

[ypatios]

I think I can reproduce this behaviour in our test system. We are using OC 19.3.

last time I tried it was reproducible on both stable.opencast.org and legacy.opencast.org (ie 19.x and 18.x).
I believe the bug was introduced with 18.4-ish.

[mwuttke]

Is there a chance to fix this issue in OC 19.4?

[ypatios]

Is there a chance to fix this issue in OC 19.4?

afaik not yet, unfortunately. i could give it another try but my chances of success are low, i'm afraid