feat: enable mojave dark mode support

[MarshallOfSound]

Electron is not built on the 10.14 SDK so we need to set a special Info.plist key to tell macOS we support dark mode.

Closes #59421
Closes #59283
Closes #54838 (maybe, the line looks a little different but I think it's how mojave dark mode windows look)

Blocked by: joaomoreno/gulp-atom-electron#51

[bpasero]

@MarshallOfSound thanks. you can use this build (Electron 3.0.x included) to try it out: https://az764295.vo.msecnd.net/exploration/1e9d10654dfff127230af65393f0d3cd285ed2e4/VSCode-darwin-exploration.zip

[MarshallOfSound]

@bpasero Works perfectly 👍

[bgarrant]

When can we get this Mojave Dark Mode support for VS Code?

[bgarrant]

@bpasero Is this expected out soon for VS Code? Dark Mode is so nice on the eyes

[warpdesign]

Is it fixed in insider builds? I still have the problem (even if macOS hasn't dark mode enabled, I see a gray line on top of VSCode).

[bpasero]

Not yet out (this week), but you can use Electron 3.0.x builds where this fix is in:

• macOS: Download
• Linux: Download
• Windows: Download

[warpdesign]

@bpasero unfortunately it doesn't fix the problem:

[bpasero]

@warpdesign those builds are old, you should get an update and then its fine