When setValue() is used on an autosizing MutltilineTextInput, the size remains the same even if the resulting text takes more lines than currently in the MultilineTextInput.
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The particular instance that I had problems with seems to be caused by a timing error where the setValue() was called just before a dialog was opened instead of after. This meant that the setValue() function and the subsequent adjustSize() function where called while the field was hidden, causing the anomaly.