Steps to reproduce:

1. Create a TextEdit element
2. type some letters in it, like "abc"
3. Press and hold shift, and use the left arrow to select all the text you just entered.
4. Now release shift, and press the left arrow once again. Since the cursor is at the beginning of the text, the expected behavior is that the text should be unselected.

Instead of that, the selection remains, but starts erasing itself when you move the cursor, either with the keyboard or the mouse. (display bug)