Support background color on MacOS

[Matts966]

What kind of change does this PR introduce?

• Feature
• Documentation

Did this PR introduce a breaking change?

A breaking change includes anything that breaks backwards compatibility either at compile or run time.

• No

Support colorized title bar by g:neovide_background_color for macOS, discussed in #1298

[Matts966]

2022-08-06.7.59.35.mov

[MultisampledNight]

Thank you! Three small things I'd like to have addressed before driving this thing home.

[Matts966]

@MultisampledNight
Thank you for your nice review :)
I fixed your points and confirmed cargo fmt --check exit with code 0.

[MultisampledNight]

Alright then, I think this should be ready to go. Thank you again!

One small thing for the future in case you contribute again somewhere (also applies not only to this repo): Consider making a branch on your fork for every PR you make, and don't directly commit to your fork's main. This avoids some tricky local git scenarios where technically both origin and your remote are checked out, but both branches are named main.

[Matts966]

@MultisampledNight
Thank you for your kind fix 🥹

[zhaozg]

I got error on MacOS X86_64

[I] ✘101 ➜ PYTHON=python3 cargo build --release
   Compiling neovide v0.9.0 (/Users/zhaozg/work/extra/vide)
error[E0433]: failed to resolve: use of undeclared crate or module `cocoa`
 --> src/window/draw_background.rs:4:5
  |
4 | use cocoa::appkit::{NSColor, NSWindow};
  |     ^^^^^ use of undeclared crate or module `cocoa`

error[E0433]: failed to resolve: use of undeclared crate or module `cocoa`
 --> src/window/draw_background.rs:5:5
  |
5 | use cocoa::base::{id, nil};
  |     ^^^^^ use of undeclared crate or module `cocoa`

error[E0433]: failed to resolve: use of undeclared crate or module `objc`
 --> src/window/draw_background.rs:8:5
  |
8 | use objc::{rc::autoreleasepool, runtime::YES};
  |     ^^^^ use of undeclared crate or module `objc`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `neovide` due to 3 previous errors

[MultisampledNight]

Oh welp, I'll try to take care of it.

[MultisampledNight]

I think I got it. Could you try again?

[zhaozg]

I think I got it. Could you try again?

It's works, thank you.