When Up & Down arrow keys from Frame Debugger are selected then the text from the whole editor gets distorted, refer to the attached video.

Steps to repro:
1. Create a new project
2. Select > Hierarchy > 3D object > cube.
3. Window > Analysis > Frame Debugger.
4. Frames are select using Up & Down arrow keys.

Actual Result:
Text in editor gets distorted when frames are selected using up & Down arrow keys from Frame Debugger

Expected Result:
Frames are select using up & Down arrow keys viewed gracefully in the Frame Debugger window.

Occurring on:
2020.2.0a5, 2020.1.0b4, 2019.3.7f1, 2019.3.0b1, 2019.3.0a1, 2019.2.18f1, 2019.1.14f1.

Workaround;
When scene is saved, editor gets back to normal state.

Environment:
Occurring on Mac 10.15