Buy/split unit stack dialogue not letting you input specific number for touch devices

[Novicek]

Preliminary checks

• [X] I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

Sometimes when managing large numbers of troops, I want to split them into specific size. Fheroes2 only lets you do that by splitting in half or using the arrow buttons to "scroll" to the desired number. The original game offered an input for typing in the desired number when clicking on it.

Describe the possible solution

Implement an input dialogue.

Additional info

Vanilla (DosBox)