chore: upgrade libghostty and preserve terminal behavior (#3906)

1 files changed, 12 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/src/simd/main.zig b/vendor/libghostty-vt/src/simd/main.zig
index aabdd21d..8a3f0067 100644
--- a/vendor/libghostty-vt/src/simd/main.zig
+++ b/vendor/libghostty-vt/src/simd/main.zig
@@ -9,6 +9,18 @@ pub const index_of = @import("index_of.zig");
 pub const vt = @import("vt.zig");
 pub const codepointWidth = codepoint_width.codepointWidth;
 
+/// The number of vector lanes to use for manually vectorized hot
+/// loops operating on elements of type T, or null if the target has
+/// no usable SIMD support and a plain scalar loop should be used
+/// instead (e.g. wasm32 without simd128).
+///
+/// This is twice the native vector width so that each iteration works
+/// two vector registers, giving better instruction-level parallelism.
+pub fn lanes(comptime T: type) ?comptime_int {
+    const native = std.simd.suggestVectorLength(T) orelse return null;
+    return native * 2;
+}
+
 test {
     @import("std").testing.refAllDecls(@This());
 }