Cannot add spaces in custom signals/slots

Steps to reproduce:

• Add PushButton
• Right click push button => Change Signals/Slots
• Add new signal and try to add spaces

Expected:

• Spaces are added such that I can write "mySIgnal(const Xyz)"

Actual:

• I can only enter "mySignal(constXyz)"

( The same is true if you try to add a custom slot )