config: introduce macos-window-shadow

macos/Sources/Features/Terminal/TerminalController.swift

@@ -186,8 +186,7 @@ class TerminalController: NSWindowController, NSWindowDelegate,
         // If we have window transparency then set it transparent. Otherwise set it opaque.
         if (ghostty.config.backgroundOpacity < 1) {
             window.isOpaque = false
-            window.hasShadow = false
+
-            
             // This is weird, but we don't use ".clear" because this creates a look that
             // matches Terminal.app much more closer. This lets users transition from
             // Terminal.app more easily.
@@ -196,10 +195,11 @@ class TerminalController: NSWindowController, NSWindowDelegate,
             ghostty_set_window_background_blur(ghostty.app, Unmanaged.passUnretained(window).toOpaque())
         } else {
             window.isOpaque = true
-            window.hasShadow = true
             window.backgroundColor = .windowBackgroundColor
         }
         
+        window.hasShadow = ghostty.config.macosWindowShadow
+        
         guard window.hasStyledTabs else { return }
 
         // The titlebar is always updated. We don't need to worry about opacity

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -236,6 +236,14 @@ extension Ghostty {
             return v
         }
         
+        var macosWindowShadow: Bool {
+            guard let config = self.config else { return false }
+            var v = false;
+            let key = "macos-window-shadow"
+            _ = ghostty_config_get(config, &v, key, UInt(key.count))
+            return v
+        }
+        
         var backgroundColor: Color {
             var rgb: UInt32 = 0
             let bg_key = "background"
@@ -268,6 +276,14 @@ extension Ghostty {
             return v;
         }
         
+        var backgroundBlurRadius: Int {
+            guard let config = self.config else { return 1 }
+            var v: Int = 0
+            let key = "background-blur-radius"
+            _ = ghostty_config_get(config, &v, key, UInt(key.count))
+            return v;
+        }
+        
         var unfocusedSplitOpacity: Double {
             guard let config = self.config else { return 1 }
             var opacity: Double = 0.85

src/config/Config.zig

@@ -985,6 +985,11 @@ keybind: Keybinds = .{},
 /// This does not work with GLFW builds.
 @"macos-option-as-alt": OptionAsAlt = .false,
 
+/// Whether to enable the macOS window shadow. The default value is true.
+/// With some window managers and window transparency settings, you may
+/// find false more visually appealing.
+@"macos-window-shadow": bool = true,
+
 /// Put every surface (tab, split, window) into a dedicated Linux cgroup.
 ///
 /// This makes it so that resource management can be done on a per-surface