To reproduce
============
- go on any record with list view (for example a Quotation)
- Check many hidden fields in the list view to show them
- The dialogue box for checking and unchecking hidden fields moves
with the horizontal scrollbar, sometimes even going off screen.
Problem
=======
the position of the dropdown menu is computed using the position of the toggler
butoon, so if this button moves the menu moves with it
Solution
========
make the toggler button sticky so it's always visible and the dropdawn menu
will keep same position.
opw-3589726
closesodoo/odoo#145784
X-original-commit: 6fb2619866893b47c8cb947a40f3457625960a5c
Signed-off-by: Bastien Fafchamps (bafa) <bafa@odoo.com>
Signed-off-by: Abdelouahab Laaroussi (abla) <abla@odoo.com>