chore: update vendored libghostty-vt

refs #276

3 files changed, 22 insertions, 227 deletions

diff --git a/vendor/patches/libghostty-vt/0001-backport-resizecols-cursor-subtraction.patch b/vendor/patches/libghostty-vt/0001-backport-resizecols-cursor-subtraction.patch
deleted file mode 100644
index 1f8d0f36..00000000
--- a/vendor/patches/libghostty-vt/0001-backport-resizecols-cursor-subtraction.patch
+++ /dev/null
@@ -1,115 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: herdr maintainers <maintainers@herdr.dev>
-Date: Thu, 4 Jun 2026 00:00:00 +0000
-Subject: [PATCH] backport resizeCols cursor subtraction saturation
-
-Backport ghostty-org/ghostty#12907 onto the vendored libghostty-vt source.
-Shrink-both resize can leave the old cursor row past the new row count after
-resizeWithoutReflow reduces self.rows. Saturating subtraction treats rows below
-that cursor as zero instead of trapping in safety builds.
-
-Herdr issue: https://github.com/ogulcancelik/herdr/issues/465
-Upstream discussion: https://github.com/ghostty-org/ghostty/discussions/12905
-Upstream PR: https://github.com/ghostty-org/ghostty/pull/12907
-Vendored base: 0f7cd84b880b203c98683e520e84b9db0c5938d8
----
- vendor/libghostty-vt/src/terminal/PageList.zig    | 33 +++++++++++++++++++++--
- vendor/libghostty-vt/src/terminal/c/terminal.zig  | 23 ++++++++++++++++
- 2 files changed, 54 insertions(+), 2 deletions(-)
-
-diff --git a/vendor/libghostty-vt/src/terminal/PageList.zig b/vendor/libghostty-vt/src/terminal/PageList.zig
-index 0000000..0000000 100644
---- a/vendor/libghostty-vt/src/terminal/PageList.zig
-+++ b/vendor/libghostty-vt/src/terminal/PageList.zig
-@@ -1059,7 +1059,7 @@ fn resizeCols(
-         break :cursor .{
-             .tracked_pin = c.pin orelse try self.trackPin(p),
-             .untrack = c.pin == null,
--            .remaining_rows = self.rows - c.y - 1,
-+            .remaining_rows = self.rows -| (c.y + 1),
-             .wrapped_rows = wrapped,
-         };
-     } else null;
-@@ -1192,7 +1192,7 @@ fn resizeCols(
-             break :wrapped wrapped;
-         };
- 
--        const current = self.rows - active_pt.active.y - 1;
-+        const current = self.rows -| (active_pt.active.y + 1);
- 
-         var req_rows = c.remaining_rows;
-         req_rows -|= wrapped -| c.wrapped_rows;
-@@ -10828,6 +10828,37 @@ test "PageList resize (no reflow) less rows and cols" {
-     }
- }
- 
-+test "PageList resize less rows and cols cursor at bottom" {
-+    const testing = std.testing;
-+    const alloc = testing.allocator;
-+
-+    var s = try init(alloc, 80, 24, 0);
-+    defer s.deinit();
-+
-+    const cursor_pin = try s.trackPin(s.pin(.{ .active = .{
-+        .x = 0,
-+        .y = s.rows - 1,
-+    } }).?);
-+    defer s.untrackPin(cursor_pin);
-+
-+    // Shrink both axes so the original cursor.y is strictly past the new row
-+    // count, after resizeWithoutReflow has already reduced self.rows.
-+    try s.resize(.{
-+        .cols = 79,
-+        .rows = 20,
-+        .reflow = true,
-+        .cursor = .{ .x = 0, .y = 23, .pin = cursor_pin },
-+    });
-+    try testing.expectEqual(@as(usize, 79), s.cols);
-+    try testing.expectEqual(@as(usize, 20), s.rows);
-+
-+    // remaining_rows saturates to 0, so the cursor lands on the new bottom row.
-+    try testing.expectEqual(point.Point{ .active = .{
-+        .x = 0,
-+        .y = s.rows - 1,
-+    } }, s.pointFromPin(.active, cursor_pin.*).?);
-+}
-+
- test "PageList resize (no reflow) more rows and less cols" {
-     const testing = std.testing;
-     const alloc = testing.allocator;
-diff --git a/vendor/libghostty-vt/src/terminal/c/terminal.zig b/vendor/libghostty-vt/src/terminal/c/terminal.zig
-index 0000000..0000000 100644
---- a/vendor/libghostty-vt/src/terminal/c/terminal.zig
-+++ b/vendor/libghostty-vt/src/terminal/c/terminal.zig
-@@ -1005,6 +1005,29 @@ test "resize invalid value" {
-     try testing.expectEqual(Result.invalid_value, resize(t, 80, 0, 9, 18));
- }
- 
-+test "resize shrinks both axes with cursor at bottom" {
-+    var t: Terminal = null;
-+    try testing.expectEqual(Result.success, new(
-+        &lib.alloc.test_allocator,
-+        &t,
-+        .{
-+            .cols = 80,
-+            .rows = 24,
-+            .max_scrollback = 0,
-+        },
-+    ));
-+    defer free(t);
-+
-+    // CSI 24;1H parks the cursor on the bottom row.
-+    const move = "\x1b[24;1H";
-+    vt_write(t, move, move.len);
-+
-+    // Shrink both axes; pre-resize cursor.y sits past the new bottom row.
-+    try testing.expectEqual(Result.success, resize(t, 79, 23, 8, 16));
-+    try testing.expectEqual(79, t.?.terminal.cols);
-+    try testing.expectEqual(23, t.?.terminal.rows);
-+}
-+
- test "mode_get and mode_set" {
-     var t: Terminal = null;
-     try testing.expectEqual(Result.success, new(
--- 
-2.49.0
diff --git a/vendor/patches/libghostty-vt/0001-default-grapheme-cluster-mode.patch b/vendor/patches/libghostty-vt/0001-default-grapheme-cluster-mode.patch
new file mode 100644
index 00000000..546112c7
--- /dev/null
+++ b/vendor/patches/libghostty-vt/0001-default-grapheme-cluster-mode.patch
@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: herdr maintainers <maintainers@herdr.dev>
+Date: Wed, 15 Jul 2026 00:00:00 +0000
+Subject: [PATCH] default lib-vt panes to grapheme clustering
+
+Herdr renders libghostty-vt cells directly and requires DEC mode 2027 to
+store multi-codepoint grapheme clusters in one terminal cell. Set it in the
+terminal's default modes so RIS restores clustering instead of disabling it.
+
+Herdr issue: https://github.com/ogulcancelik/herdr/issues/243
+Vendored base: c5a21edfcbc2d5b46540ad91b7980aca31f5f1f3
+---
+diff --git a/vendor/libghostty-vt/src/terminal/c/terminal.zig b/vendor/libghostty-vt/src/terminal/c/terminal.zig
+index 1c3b9f0c..a896c0fd 100644
+--- a/vendor/libghostty-vt/src/terminal/c/terminal.zig
++++ b/vendor/libghostty-vt/src/terminal/c/terminal.zig
+@@ -344,4 +344,5 @@ fn new_(
+         .rows = opts.rows,
+         .max_scrollback = opts.max_scrollback,
++        .default_modes = .{ .grapheme_cluster = true },
+     });
+     errdefer t.deinit(alloc);
diff --git a/vendor/patches/libghostty-vt/0002-expose-kitty-image-transmit-time-ns.patch b/vendor/patches/libghostty-vt/0002-expose-kitty-image-transmit-time-ns.patch
deleted file mode 100644
index 4289740c..00000000
--- a/vendor/patches/libghostty-vt/0002-expose-kitty-image-transmit-time-ns.patch
+++ /dev/null
@@ -1,112 +0,0 @@
-diff --git a/vendor/libghostty-vt/include/ghostty/vt/kitty_graphics.h b/vendor/libghostty-vt/include/ghostty/vt/kitty_graphics.h
-index 9bace3a..d5b5006 100644
---- a/vendor/libghostty-vt/include/ghostty/vt/kitty_graphics.h
-+++ b/vendor/libghostty-vt/include/ghostty/vt/kitty_graphics.h
-@@ -343,6 +343,15 @@ typedef enum GHOSTTY_ENUM_TYPED {
-    */
-   GHOSTTY_KITTY_IMAGE_DATA_DATA_LEN = 8,
- 
-+  /**
-+   * Timestamp of the image's most recent transmission, in nanoseconds.
-+   * The epoch is unspecified; only equality and ordering between values
-+   * read from the same terminal are meaningful.
-+   *
-+   * Output type: uint64_t *
-+   */
-+  GHOSTTY_KITTY_IMAGE_DATA_TRANSMIT_TIME_NS = 9,
-+
-   GHOSTTY_KITTY_IMAGE_DATA_MAX_VALUE = GHOSTTY_ENUM_MAX_VALUE,
- } GhosttyKittyGraphicsImageData;
- 
-diff --git a/vendor/libghostty-vt/src/terminal/c/kitty_graphics.zig b/vendor/libghostty-vt/src/terminal/c/kitty_graphics.zig
-index d50b8c4..a00632e 100644
---- a/vendor/libghostty-vt/src/terminal/c/kitty_graphics.zig
-+++ b/vendor/libghostty-vt/src/terminal/c/kitty_graphics.zig
-@@ -178,6 +178,7 @@ pub const ImageData = enum(c_int) {
-     compression = 6,
-     data_ptr = 7,
-     data_len = 8,
-+    transmit_time_ns = 9,
- 
-     pub fn OutType(comptime self: ImageData) type {
-         return switch (self) {
-@@ -187,6 +188,7 @@ pub const ImageData = enum(c_int) {
-             .compression => ImageCompression,
-             .data_ptr => [*]const u8,
-             .data_len => usize,
-+            .transmit_time_ns => u64,
-         };
-     }
- };
-@@ -258,11 +260,22 @@ fn imageGetTyped(
-         .compression => out.* = image.compression,
-         .data_ptr => out.* = image.data.ptr,
-         .data_len => out.* = image.data.len,
-+        .transmit_time_ns => out.* = instantNanos(image.transmit_time),
-     }
- 
-     return .success;
- }
- 
-+/// Flattens an Instant's platform timestamp to nanoseconds for the C API.
-+/// The epoch is unspecified; only equality and ordering are meaningful.
-+fn instantNanos(instant: std.time.Instant) u64 {
-+    if (@TypeOf(instant.timestamp) == u64) return instant.timestamp;
-+    const ts = instant.timestamp;
-+    const sec: u64 = @intCast(@max(ts.sec, 0));
-+    const nsec: u64 = @intCast(@max(ts.nsec, 0));
-+    return sec *| std.time.ns_per_s +| nsec;
-+}
-+
- pub fn placement_iterator_new(
-     alloc_: ?*const CAllocator,
-     out: *PlacementIterator,
-@@ -977,6 +990,48 @@ test "image_get_handle and image_get with transmitted image" {
-     try testing.expect(data_len > 0);
- }
- 
-+test "image_get transmit_time_ns changes on retransmission" {
-+    if (comptime !build_options.kitty_graphics) return error.SkipZigTest;
-+
-+    var t: terminal_c.Terminal = null;
-+    try testing.expectEqual(Result.success, terminal_c.new(
-+        &lib.alloc.test_allocator,
-+        &t,
-+        .{ .cols = 80, .rows = 24, .max_scrollback = 0 },
-+    ));
-+    defer terminal_c.free(t);
-+
-+    const cmd = "\x1b_Ga=T,t=d,f=24,i=1,p=1,s=1,v=2;////////\x1b\\";
-+    terminal_c.vt_write(t, cmd.ptr, cmd.len);
-+
-+    var graphics: KittyGraphics = undefined;
-+    try testing.expectEqual(Result.success, terminal_c.get(
-+        t,
-+        .kitty_graphics,
-+        @ptrCast(&graphics),
-+    ));
-+
-+    var first: u64 = undefined;
-+    try testing.expectEqual(Result.success, image_get(
-+        image_get_handle(graphics, 1),
-+        .transmit_time_ns,
-+        @ptrCast(&first),
-+    ));
-+    try testing.expect(first > 0);
-+
-+    std.Thread.sleep(1 * std.time.ns_per_ms);
-+    const retransmit = "\x1b_Ga=t,t=d,f=24,i=1,s=1,v=2;AAAAAAAA\x1b\\";
-+    terminal_c.vt_write(t, retransmit.ptr, retransmit.len);
-+
-+    var second: u64 = undefined;
-+    try testing.expectEqual(Result.success, image_get(
-+        image_get_handle(graphics, 1),
-+        .transmit_time_ns,
-+        @ptrCast(&second),
-+    ));
-+    try testing.expect(second > first);
-+}
-+
- test "placement_rect with transmit and display" {
-     if (comptime !build_options.kitty_graphics) return error.SkipZigTest;
-