Bug
===
In knowledge, when we move for the first time a property, the popover
position is wrong. The technical reason is that the component DOM is
updated one time before the props changed, and so the DOM is not
up to date when we compute the new position.
Also, the popover might change it's relative position (top VS bottom)
and so the small arrow might be incorrect in that case. Always remove
it (rectangle popover better than a wrong arrow direction).
Task-2980121
X-original-commit: de37a3393b31d48add36fc6be5febf70dc3db31e
Part-of: odoo/odoo#102243
std-odoo
1c6270ce97