[MU4 Issue] PNG Export dialog - Resolution - unable to enter more than 3 digits

[sammik]

Describe the bug It is not possible, to enter more than 3 digits in Export - PNG - Resolution dialog

To Reproduce Steps to reproduce the behavior:

1. Open Score
2. Export - PNG
3. Try to enter new resolution higher, than "999"

Expected behavior Any "allowed" resolution should be enterable

Screenshots

https://user-images.githubusercontent.com/1646034/184036158-b7b21a6a-7727-40ec-b572-b01402399a40.mp4

Platform information

• OS: [reported on Linux]

Additional context

• Higher resolution is possible to achieve by hitting UP arrow.
• In MU3, it worked well.