software interface disappears in some case

[A-hoy]

As you can see above, the preferences interface disappears when i select any drop-down list every time. And it appears again when i minimize the window and restore it（double click it in the taskbar）.

Analogously, the editor interface will disappear in some case, the following steps could reproduce the issue:

1. open typora
2. just type anything for later viewing
3. create new window and type something
4. repeat step 3 and now we have 3 windows.
5. switch to the first windows and you will find the editor interface disappear. But if i try to minimize it and restore it, the editor interface will appear.

This issue could appears even if create 2 windows, but not always.

typora version: 0.9.86
os version: Win10 - 32bit (10.0.18363.657)

[abnerlee]

please try #2051

We will upgrade the Electron base which may help