[Spike] Investigate "[EuiBottomBar] Fixed position... #9242" #9255
Description
Per a discussion on 12/02/25 in our weekly team sync:
This appears to be a long-standing issue related to the EuiPortal component.
The severity of the issue is high, as it can crash the UI. However, the scope is unknown -- it is not clear how often this happens in Kibana.
The urgency is low, simply because a workaround does exist today to prevent this, which is to set usePortal={false}. However, it is likely that users are unaware of this issues and likely simply use the defauljt for EuiBottomBar, which is usePortal={true}.
We should do some analysis to determine a path forward:
- How often are users experiencing this bug in Kibana? Analyze the specific conditions under which it happens and compare current Kibana usage to identify problems.
- What is a short term solution -- can we simply update existing usage in Kibana to
usePortal={false}? Can we add additional guidance to prevent this? Can we simply remove portaling -- or is that a harder to fix? - (Stretch) Long term, consider what could be done about portaling generally in EUI, which is overused, unnecessary, and problematic.