Bisecting points to rBbdda53fdb29d as the cause.
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**System Information:**
Operating system: Linux-5.4.0-7634-generic-x86_64-with-debian-bullseye
Graphics card: GTX 1050Ti 440.82
**Blender Version:**
Broken: 2.90.0 Alpha, branch: master, commit date: 2020-06-15 10:35, hash: `rB2797a63a6606`
Worked: 2.83.0, 2.90.0 `rB074d469165c7` (2020-06-02 08:39)
**Short description of error:**
The movie clip editor icon seems to flicker between two icons as the user interface updates. Here's a video example:
{F8620958}
**Exact steps for others to reproduce the error:**
1. Open a movie clip editor.
2. Move your mouse across the header of the movie clip editor and onto other editors in Blender.
3. Notice how the movie clip editor icon flickers between two icons. (see screenshot below)
{F8620954}