Ghost labels on screen #412

Describe the bug
The label below each screen persists at the position of the pointer even after switching from overview mode. Appears as if it's related to the window name which appears on the top of the screen, as the label disappears when pointer is hovered over the window name.

To Reproduce
Steps to reproduce the behavior:

1. Open any window
2. Switch to overview mode by hovering pointer on the top left of the screen
3. Select any window
4. The label persists where the pointer is

Expected behavior
There should be no label.

Screenshots

Environment (please complete the following information):

• OS: Arch Linux 6.17.7
• GNOME Shell version: 49.1
• Unite version: v83