Add "-" buttons on Mission Menu

[linmar22]

Once some units are added to the upcoming mission, the units cannot be lowered. The "+" button should also add single units, not in pairs.

[shdwp]

You can edit the value manually. + don't add pairs, it add double of what you have in stock. Given that you'd usually scramble only 2-4 aircraft but armor would go in bigger amounts (8-16) that feature seems fine to me.

As for the minus - guess I could add it, its not that big of a deal.

[Khopa]

I think this menu could use the Tkinter Spinbox widget instead of the Entry + a Button. With the Spinbox you can also actually cap and limit the values too, which is another issue with the current implementation.

( And i have to admit that i've always been confused by the plus button behaviour too. )

[linmar22]

Even though aircraft fly in pairs, there's scenarios where this doesn't apply - for example when an airfield has an odd number of aircraft available, and you want to send all of them. Or if a user flies solo, and there's more than one aircraft available. Furthermore, there's no discernible convention - the input fields and buttons look the same, but act differently - some add 1, some 2, some 8. Makes it confusing. A slider or multiple buttons would make a lot more sense IMO. Replacing the text field with a non-editable UI element would also prevent the user from inputting invalid data, like selecting a larger number of aircraft than available. Specifically - these changes would conform to Nielsen's "Error Prevention" and "Recognition rather than Recall"

[shdwp]

Well, the criticism is valid, although I don't want to spend the limited development time on this, to be honest, not on this stage.

Also code behind UI would prevent using more than units that available obviously.