QSyntaxtHighlighter::rehighlight doesn't update TextEdit

QQuickTextEdit::invalidateBlock method marks nodes as dirty but doesn't
call QQuickItem::update(). Because of that it's impossible to
rehighlight text by QSyntaxHighlighter.

Example is attached.

Expected behavior: text's color is changed on radio button click.
Actual behavior: nothing happens until somebody updates text edit itself (by moving cursor/selection/text editing).