Extra space after question reference when used at the beginning of the label

[nmandrescu]

Describe the bug When a question is referenced in another question label at the beginning of that other question label, then an extra space is added after referenced value.

To Reproduce Steps to reproduce the behavior. If applicable please include the smallest possible XLSForm or XForm (as zip or link). space-prefix.xlsx.zip

1. Add a hidden field hiddenField with default value ABC
2. Add a text question1 with ${hiddenField}123 at the beginning of the label
3. Add another text question2 with ${hiddenField}123 not at the beginning of the label
4. Open survey and see that in question1 after ABC there is an extra space before 123. This space is not present in question2, which is the expected behavior.

type	name	label	default	required
hidden	hiddenField	hiddenField	ABC	false
text	question1	${hiddenField}123 => a space is added after hiddenField reference		false
text	question2	AnyPrefixText ${hiddenField}123 => no space prefix after hiddenField reference, as expected		false

Expected behavior No space must be added after reference of the question in another question.

Screenshots

Browser and OS (please complete the following information):

• OS: Linux
• Browser: Firefox 86.0 (64-bit)

Additional context The space is added only if the referenced question is placed at the beginning of the other question label.