macOS: treat C-/ specially again to prevent beep

Fixes #7310

macos/Sources/Ghostty/SurfaceView_AppKit.swift

@@ -1066,6 +1066,16 @@ extension Ghostty {
 
                 equivalent = "\r"
 
+            case "/":
+                // Treat C-/ as C-_. We do this because C-/ makes macOS make a beep
+                // sound and we don't like the beep sound.
+                if (!event.modifierFlags.contains(.control) ||
+                    !event.modifierFlags.isDisjoint(with: [.shift, .command, .option])) {
+                    return false
+                }
+
+                equivalent = "_"
+
             default:
                 // It looks like some part of AppKit sometimes generates synthetic NSEvents
                 // with a zero timestamp. We never process these at this point. Concretely,

src/input/key.zig

@@ -149,9 +149,6 @@ pub const Mods = packed struct(Mods.Backing) {
     pub fn translation(self: Mods, option_as_alt: config.OptionAsAlt) Mods {
         var result = self;
 
-        // Control is never used for translation.
-        result.ctrl = false;
-
         // macos-option-as-alt for darwin
         if (comptime builtin.target.os.tag.isDarwin()) alt: {
             // Alt has to be set only on the correct side
@@ -187,14 +184,6 @@ pub const Mods = packed struct(Mods.Backing) {
         );
     }
 
-    test "translation removes control" {
-        const testing = std.testing;
-
-        const mods: Mods = .{ .ctrl = true };
-        const result = mods.translation(.true);
-        try testing.expectEqual(Mods{}, result);
-    }
-
     test "translation macos-option-as-alt" {
         if (comptime !builtin.target.os.tag.isDarwin()) return error.SkipZigTest;