Catalina 10.15.1, MacVim 8.1.2234 full screen before sleep, full screen is broken on wake

Describe the bug

After waking the computer up, MacVim which used to be full screen is no longer full screen. The "full screen window" where MacVim is supposed to live is still there, but the MacVim window itself is not full screen, and exists on a Desktop "window". I'm not sure of the correct term here, but by "window" I mean the full screen switcher which appears at the top of the screen when in what used to be called expose mode.

The MacVim window is mostly unresponsive -- keypresses do not have any visible affect, and clicking the window doesn't either. When using the macOS application switcher, the "full screen window" is activated when attempting to switch to MacVim, but the screen is black.

If only one MacVim window is open, sometimes the green full-screen button works and will put the window back. Sometimes not. I believe that when multiple windows are open, the green full screen button never works.

Often the only way to get back to a working application is to force quit macvim.

If the terminal with which I launched MacVim is still open, a message like this is printed:

2019-12-23 05:57:59.389 MacVim[10882:9934680] not in fullscreen state

To Reproduce

This is a bit of a head scratcher for me, but I believe I'm able to reproduce it intermittently in this way. I see this bug several times a week, but it is not consistent.

• Open a file in MacVim - I usually do this with mvim in the terminal.
• Full Screen MacVim
• Put computer to sleep for a while -- short sleeps don't seem to trigger it.
• Wake computer

Expected behavior

The application should not lose it's full screen status.

Screenshots

I will attempt to take a concise screen recording next time I see the problem.

Environment:

• Vim version 8.1.2234
• OS: macOS 10.15.1 (19B88)
• stock macOS terminal.

I cannot see how it would matter, but my vim config is on github as is my list of plugins

首先在 macOS 10.15.1 上使用 MacVim 8.1.2234 重现间歇性故障：使用 mvim 打开一个文件，进入全屏模式，让电脑睡眠，然后唤醒电脑。比较只有一个窗口和有多个窗口时的行为，包括“not in fullscreen state”消息。完成的标准是 MacVim 在唤醒后仍能响应，并保留全屏状态。