Unable to get highlighting working on TextEdit

TL;DR: TextEdit paints highlighted text only when I click on it. Nothing helps

I have a ListView with a QAbstractListModel model with string properties. Those string properties are being spellchecked and QSyntaxHighlighter is used to show spell errors. I create QSyntaxHighlighter descendant in Component.onCompleted of TextEdit. I double-checked highlighting get's executed with correct spell errors and setFormat() of Highlighter is executed with correct positions. The problem is that it draws text in red (invalidates) only when I click on the TextEdit itself.

TextEdit lives in a Flickable (to track cursor) and Flickable lives in a Rectangle (to have nice background and border). Binding to some signals and calling update() of TextEdit does not help.

After spellcheck finishes, I emit rehighlight() signal of created SyntaxHighlighter.

Code:

---

Rectangle {
  id: descriptionRect
  height: 30
  border.width: descriptionTextInput.activeFocus ? 1 : 0
  clip: true
 
  Flickable {
      id: descriptionFlick
      contentWidth: descriptionTextInput.paintedWidth
      contentHeight: descriptionTextInput.paintedHeight
      anchors.fill: parent
      interactive: false
      flickableDirection: Flickable.HorizontalFlick
      height: 30
      clip: true
      focus: false
 
      function ensureVisible(r) {
          if (contentX >= r.x)
              contentX = r.x;
          else if (contentX+width <= r.x+r.width)
              contentX = r.x+r.width-width;
      }
 
      TextEdit {
          id: descriptionTextInput
          width: descriptionFlick.width
          height: descriptionFlick.height
          text: description
          onTextChanged: model.editdescription = text
 
          Component.onCompleted: {
              globalModel.initDescriptionHighlighting(index, descriptionTextInput.textDocument)
          }
 
          onCursorRectangleChanged: descriptionFlick.ensureVisible(cursorRectangle)
         }
     }
 }

---

Any ideas how I can solve this?

Here is small sample project with demo of how it's not working until you click on a text https://bitbucket.org/ribtoks/rehighlighdemo/src