Surrounding a selection of words with indent or vertical collection yields erroneous result

[eugenschindler]

How to reproduce:

• make a number of words in a Line.
• select a subset of the words in the line
• apply one of the intentions "surround with indent/vertical collection"
• now there is an indent or vertical collection with words directly in it, but you will get an error from the MPS UI, since a vertical/indent collection can only contain lines, not words

Suggestion: either fix the bug in such a way that each of the words is wrapped in a line or disable the "surround with..." intentions for a collection of words (with a strong preference for the first option).