How to reproduce:
1. Open attached project "Case_1130997_repro.zip"
2. Open "ScriptWithErrors" script
3. Write "asdf" at the end of the script so it has errors
4. Save the script
5. Open the Editor
6. Open Animator Window
7. Try to Enter Play Mode

Expected result: The color of the editor does not change
Actual result: Some of the elements in the editor change their color as if it was Play Mode

Reproducible with - 2018.3.0a7, 2018.3.14f1, 2018.4.0f1, 2019.1.3f1, 2019.2.0b2, 2019.3.0a5
Not reproducible with - 2017.4.27f1, 2018.3.0a6

Affected windows:
1. Animator
2. Packages (Package Manager)
3. UIElements Debugger
4. UIElements Samples
5. Project Settings