The Cart "quantity" dropdown when changed to textbox allows only 2 digits that can be entered. To change this I tried the following:
- Open the template folder that is being used. You can check in "Store Design" section of Admin about the template that you are using.
- Go to Snippets and open CartItemQtyText.html file.
- Search for "maxlength=" and change the number or remove it.
- Save the changes made.