Currently when you fill quantity on the stock.move and directly click on the details operation button,
you will see move lines based on initial quantity.
It happens due to the inverse of quantity on stock.move that is only trigger on the save (expected).
But in our case, we want to do a save before opening the stock.move.line to have something according to the quantity.
We also only trigger the save when the quantity has been change and the stock.move is open.
+ Hide quantity in draft
closesodoo/odoo#140059
Signed-off-by: William Henrotin (whe) <whe@odoo.com>