Setting backgroundColor style on RichTextEditor causes text formatting to revert to defaults

Steps to reproduce:
1. Compile and run attached MXML file
2. Select the existing text and format it as fontSize: 24, bold, italic, underline, and purple.
3. Click the Button to change the RichTextEditor control's internal TextArea's background color.

Actual Results:
After clickig the button and setting the background color, the applied styles are lost and the text formatting returns to its default state.

Expected Results:
Applied styles should be maintained.

Workaround (if any):
Re-set the RichTextEditor's htmlText property after calling setStyle() on the internal TextArea (see attached file).