From a230c2b259254ab5be6d57bf985b89369e58fde7 Mon Sep 17 00:00:00 2001
From: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com>
Date: Wed, 30 Sep 2026 14:56:00 -0700
Subject: [PATCH 1/2] config: failing test, c_get cannot read
 window-padding-x/-y

cmux aligns its pane chrome to the terminal's first column and needs the
user's window-padding-x. ghostty_config_get returns false for it:
WindowPadding is a non-packed struct without cval. The test also pins
window-padding-balance, which c_get already returns as its tag name.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
---
 src/config/c_get.zig | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/config/c_get.zig b/src/config/c_get.zig
index 9bcb8d98225..811858fe505 100644
--- a/src/config/c_get.zig
+++ b/src/config/c_get.zig
@@ -238,3 +238,31 @@ test "c_get: split-preserve-zoom" {
     try testing.expect(get(&c, .@"split-preserve-zoom", @ptrCast(&bits)));
     try testing.expectEqual(@as(c_uint, 1), bits);
 }
+
+test "c_get: window padding" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    var c = try Config.default(alloc);
+    defer c.deinit();
+
+    // ghostty_config_window_padding_s
+    const Padding = extern struct { top_left: u32, bottom_right: u32 };
+    c.@"window-padding-x" = .{ .top_left = 5, .bottom_right = 9 };
+    c.@"window-padding-y" = .{ .top_left = 3, .bottom_right = 3 };
+
+    var x: Padding = undefined;
+    try testing.expect(get(&c, .@"window-padding-x", @ptrCast(&x)));
+    try testing.expectEqual(@as(u32, 5), x.top_left);
+    try testing.expectEqual(@as(u32, 9), x.bottom_right);
+
+    var y: Padding = undefined;
+    try testing.expect(get(&c, .@"window-padding-y", @ptrCast(&y)));
+    try testing.expectEqual(@as(u32, 3), y.top_left);
+    try testing.expectEqual(@as(u32, 3), y.bottom_right);
+
+    c.@"window-padding-balance" = .true;
+    var balance: [*:0]const u8 = undefined;
+    try testing.expect(get(&c, .@"window-padding-balance", @ptrCast(&balance)));
+    try testing.expectEqualStrings("true", std.mem.sliceTo(balance, 0));
+}

From b1a49b6015235d2b36a8473ff5ae72aa16db82b0 Mon Sep 17 00:00:00 2001
From: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com>
Date: Wed, 30 Sep 2026 14:56:26 -0700
Subject: [PATCH 2/2] config: c_get returns window-padding-x/-y as
 ghostty_config_window_padding_s

WindowPadding gets a C mirror and cval, so ghostty_config_get fills a
{top_left, bottom_right} pair of u32 points instead of returning false.
cmux reads it to put its tab icons on the terminal's first text column.
window-padding-balance already returns its tag name. ghostty.h declares
ghostty_config_window_padding_s.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
---
 include/ghostty.h     |  6 ++++++
 src/config/Config.zig | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/ghostty.h b/include/ghostty.h
index 3589f8f2b3f..a870140ff37 100644
--- a/include/ghostty.h
+++ b/include/ghostty.h
@@ -723,6 +723,12 @@ typedef struct {
   uint8_t b;
 } ghostty_config_color_s;
 
+// config.WindowPadding.C (window-padding-x, window-padding-y), in points
+typedef struct {
+  uint32_t top_left;
+  uint32_t bottom_right;
+} ghostty_config_window_padding_s;
+
 // config.ColorList
 typedef struct {
   const ghostty_config_color_s* colors;
diff --git a/src/config/Config.zig b/src/config/Config.zig
index ba23ccfdac2..46ca613b66e 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -10194,6 +10194,16 @@ pub const WindowPadding = struct {
     top_left: u32 = 0,
     bottom_right: u32 = 0,
 
+    /// ghostty_config_window_padding_s
+    pub const C = extern struct {
+        top_left: u32,
+        bottom_right: u32,
+    };
+
+    pub fn cval(self: Self) C {
+        return .{ .top_left = self.top_left, .bottom_right = self.bottom_right };
+    }
+
     pub fn clone(self: Self, _: Allocator) error{}!Self {
         return self;
     }