[16.0] web_chatter_position : Statusbar dropdown menu is displayed under chatter with sided mode when form view is scrollable

[Honeyxilia]

Module

web_chatter_position in OCA/web

Describe the bug

When on a record view with a statusbar and folded options (for instance, a project.task with folded project.task.type's), when the o_content element is scrollable (ie. the description is high enough, or opening the browser console), when we open the statusbar dropdown menu, it's displayed under the o_chatter element.
This renders the step names on the dropdown menu unreadable.

Images :
https://imgur.com/a/D92AaPz

To Reproduce

Affected versions: 16.0

Steps to reproduce the behavior:

1. Install web_chatter_position and a module with a form view using a statusbar for steps (ie, project)
2. Create a folded step in the parent element of the model (ie, a folded project.task.type in a project.project record)
3. Open a form view within that parent record (ie. a project.task within the above project.project)
4. Edit the record so that the o_content element is scrollable (ie. fill the description of a task)
5. Click on the statusbar dropdown menu

Expected behavior
The statusbar dropdown menu options should still be visible (either by being displayed on top of the o_chatter element, or towards the bottom left of the screen)

Additional context
Currently, I'm working on a migration on a database, where the statusbar dropdown is always displayed under the chatter element, and while debugging, I noticed this bug - if people find a fix for this issue, it might be helpful to find the reason why our database presents this bug..

[Honeyxilia]

The answer might be to designate the div element with the o_content class as the container from which the getBestPosition function should evaluate if the dropdown menu is overflowing, since currently it's based on the main div - however, I was not yet able to implement that