if you can change text input item from TextEdit to TextInput can use validator and regular expressions
from doc :
The RegExpValidator type provides a validator, which counts as valid any string which matches a specified regular expression.
in another way can get the onTextChanged signal and remove whitespace :
like this :
TextEdit {
width: 240
text: "123"
font.pointSize: 20
color: "blue"
onTextChanged:text = text.replace(/s+/g,'')
}
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