macOS fullscreen window restore

[bpasero]

Refs:

• macOS @IanMatthewHuff
• macOS @mjbvz

Complexity: 3

Create Issue

---

Synopsis:
On macOS, Electron does not allow us to restore multiple windows in fullscreen on the same display. Doing so results in ugly issues such as #157605 and #150790.

Setup:

• configure "window.restoreFullscreen": true
• prepare to have a second monitor ready

Testing

• open a window, make it fullscreen and ensure after restart the window appears fullscreen on the display you left it
• open multiple windows and make multiple windows fullscreen on the same display and verify that only the last active window restores fullscreen while the others restore but not as fullscreen
• open 1 window fullscreen on the one display and 1 window fullscreen on the other display and verify both appears as they were after restart
• briefly test that normal non-fullscreen windows restore as they are left, e.g. open 2 and size them so that you can remember on both displays

[IanMatthewHuff]

• open a window, make it fullscreen and ensure after restart the window appears fullscreen on the display you left it
• open multiple windows and make multiple windows fullscreen on the same display and verify that only the last active window restores fullscreen while the others restore but not as fullscreen
• open 1 window fullscreen on the one display and 1 window fullscreen on the other display and verify both appears as they were after restart
• briefly test that normal non-fullscreen windows restore as they are left, e.g. open 2 and size them so that you can remember on both displays

Edit: Looks solid to me, I filed one behavior issue that I was unsure if it was a bug or not.