System Information
Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon R9 M295X OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f
Worked: (optional)

Short description of error
When Blender is in fullscreen, open any panel/window like 'Save', 'Import' or even 'Preferences' it will crash.

Exact steps for others to reproduce the error

• Open Blender
• Make it fullscreen
• Save Scene
• The new panel goes directly to fullscreen, we can see in the background how the main windows goes black.
• Close or ESC the 'save scene' panel
• Crash

The default behavior in my computer when open a windows is to open it at fullscreen.
It happens with other panels too.

On 2.83alpha:
The panel doesn't go fullscreen by default, but if we make the new panel fullscreen when the main windows is fullscreen too, it will crash anyways.

Maybe related with https://developer.blender.org/T66466