fixes issue primefaces#7014: inserting mentions results in duplicated text #7017
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Fixes: #7014
The issue was that
event.target
is not the form element but actually a list item element, which doesn't have the selectionStart attribute.I've also added a change where inserting the mention in front of a space does not result in a double space.
Note: this is my first time contributing to an open source project, let me know if there's anything I can do better!