Menu bar will not appear when in full screen mode, on Catalina

The menu bar and traffic light buttons never appear, when cursor is moved to the top of screen, in macOS fullscreen mode.

### Expected
When cursor is moved to top of the screen, the menu bar should appear

### Observed
The menu bar does not appear.

### Reproduced
> 1. Click green "Enter full screen" button
> 2. Move cursor to the top of the screen to trigger the menu bar
> 3. The menu bar and traffic light buttons never appear

Make|Model|macOS Version|App Version
-|-|-|-
Apple|2012 Macbook Pro|10.15.2|2.7

Start by reproducing the issue on macOS Catalina using the listed fullscreen steps: enter fullscreen, then move the cursor to the top of the screen. Trace the app's fullscreen and menu-bar handling; done means the menu bar and traffic-light buttons appear when the cursor reaches the top edge.

Written by the indexing model from the issue text.