Before this commit, the popover was a bit far from its target. We use a margin to compensate the arrow size (8px), but we used it the wrong way, meaning that instead of applying, e.g. a margin of -8px, we applied a margin of 8px. As a consequence, popovers were always positionned at 16px from their target. closes odoo/odoo#74955 Signed-off-by: Bruno Boi <brboi@users.noreply.github.com>