Add EnableTiledWindowMargins

[NickBouwhuis]

macOS Sequoia introduced window tiling. By default, tiled windows have margins.

Margins can be disabled through System Settings > Desktop & Dock > Tiled windows have margins (under 'Windows').

This sets com.apple.WindowManager.EnableTiledWindowMargins to 0

➜  ~ defaults read com.apple.WindowManager
{
    AppWindowGroupingBehavior = 1;
    AutoHide = 0;
    EnableTiledWindowMargins = 0;
    EnableTilingByEdgeDrag = 0;
    EnableTilingOptionAccelerator = 0;
    EnableTopTilingByEdgeDrag = 0;
    HasDisplayedShowDesktopEducation = 1;
    HideDesktop = 1;
    "LastHeartbeatDateString.daily" = "2024-11-24T17:11:47Z";
    StageManagerHideWidgets = 0;
    StandardHideWidgets = 0;
}

You can also disable it by issuing this command

➜  ~ defaults write com.apple.WindowManager EnableTiledWindowMargins -bool false

Adding this options allows Nix-Darwin users to set this option declaratively.

[NickBouwhuis]

I see there is another pull request for this. Should have looked before I submitted this. Sorry!