config: Add the option toast_on_clipboard_copy (#4185)

Add a config option to enable/disable the toast shown on clipboard copy

Also suggested in
https://github.com/ghostty-org/ghostty/discussions/4165

src/apprt/gtk/Window.zig

@@ -894,8 +894,10 @@ fn gtkActionCopy(
         return;
     };
 
+    if (self.app.config.@"adw-toast".@"clipboard-copy") {
         self.sendToast("Copied to clipboard");
     }
+}
 
 fn gtkActionPaste(
     _: *c.GSimpleAction,

src/config/Config.zig

@@ -1951,6 +1951,22 @@ keybind: Keybinds = .{},
 /// Changing this value at runtime will only affect new windows.
 @"adw-toolbar-style": AdwToolbarStyle = .raised,
 
+/// Control the toasts that Ghostty shows. Toasts are small notifications
+/// that appear overlaid on top of the terminal window. They are used to
+/// show information that is not critical but may be important.
+///
+/// Valid values are:
+///
+///   - `clipboard-copy` (default: true) - Show a toast when text is copied
+///     to the clipboard.
+///
+/// You can prefix any value with `no-` to disable it. For example,
+/// `no-clipboard-copy` will disable the clipboard copy toast. Multiple
+/// values can be set by separating them with commas.
+///
+/// This configuration only applies to GTK with Adwaita enabled.
+@"adw-toast": AdwToast = .{},
+
 /// If `true` (default), then the Ghostty GTK tabs will be "wide." Wide tabs
 /// are the new typical Gnome style where tabs fill their available space.
 /// If you set this to `false` then tabs will only take up space they need,
@@ -5451,6 +5467,11 @@ pub const AdwToolbarStyle = enum {
     @"raised-border",
 };
 
+/// See adw-toast
+pub const AdwToast = packed struct {
+    @"clipboard-copy": bool = true,
+};
+
 /// See mouse-shift-capture
 pub const MouseShiftCapture = enum {
     false,