fixing some crashes

1 files changed, 11 insertions, 1 deletions

diff --git a/build.zig b/build.zig
index c62ee222..a4d530f1 100644
--- a/build.zig
+++ b/build.zig
@@ -314,10 +314,20 @@ pub fn build(b: *std.Build) void {
     // consumed, and the defaults otherwise drag ghostty's app graph into the
     // build — gtk4 header translation via host pkg-config for linux targets,
     // the Xcode app graph (iOS SDK, xcodebuild) on darwin hosts.
+    // NEVER hand ghostty `.Debug`: that flips its `slow_runtime_safety`, which
+    // walks the whole PageList after every mutation and PANICS the app on a
+    // transient state its own next lines repair — `PageList.resizeCols` grows
+    // rows BEFORE it moves a history viewport pin back into the active area,
+    // so widening a window whose scrollback holds wrapped lines dies with
+    // "PageList integrity check failed: ViewportPinInsufficientRows". Those
+    // checks are a ghostty-development tool (upstream ships them off); Zig's
+    // own safety checks come from OUR optimize mode and are unaffected, since
+    // ghostty-vt is a module compiled into this binary. See reflow.snap.
+    const ghostty_optimize: std.builtin.OptimizeMode = if (optimize == .Debug) .ReleaseSafe else optimize;
     const ghostty_dep = if (is_emscripten)
         b.lazyDependency("ghostty", .{ .simd = false })
     else
-        b.lazyDependency("ghostty", .{ .target = target, .optimize = optimize, .simd = ghostty_simd, .@"app-runtime" = .none, .@"emit-xcframework" = false });
+        b.lazyDependency("ghostty", .{ .target = target, .optimize = ghostty_optimize, .simd = ghostty_simd, .@"app-runtime" = .none, .@"emit-xcframework" = false });
     if (ghostty_dep) |dep| {
         const ghostty_vt = dep.module("ghostty-vt");
         ghostty_vt_for_snap = ghostty_vt;