From c1bb27c45046ea242892af16b5655110537f6540 Mon Sep 17 00:00:00 2001
From: Karl Seguin <k@openmymind.io>
Date: Thu, 19 Mar 2026 06:52:41 +0800
Subject: [PATCH] better encapsulate arena reset

---
 src/ArenaPool.zig            | 5 +++++
 src/browser/StyleManager.zig | 5 +----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/ArenaPool.zig b/src/ArenaPool.zig
index 2f8de17f..608445f6 100644
--- a/src/ArenaPool.zig
+++ b/src/ArenaPool.zig
@@ -100,6 +100,11 @@ pub fn reset(_: *const ArenaPool, allocator: Allocator, retain: usize) void {
     _ = arena.reset(.{ .retain_with_limit = retain });
 }
 
+pub fn resetRetain(_: *const ArenaPool, allocator: Allocator) void {
+    const arena: *std.heap.ArenaAllocator = @ptrCast(@alignCast(allocator.ptr));
+    _ = arena.reset(.retain_capacity);
+}
+
 const testing = std.testing;
 
 test "arena pool - basic acquire and use" {
diff --git a/src/browser/StyleManager.zig b/src/browser/StyleManager.zig
index 000bd89d..a7765814 100644
--- a/src/browser/StyleManager.zig
+++ b/src/browser/StyleManager.zig
@@ -90,10 +90,7 @@ fn rebuildIfDirty(self: *StyleManager) !void {
 
     self.dirty = false;
     const item_count = self.rules.items.len;
-
-    const arena: *std.heap.ArenaAllocator = @ptrCast(@alignCast(self.arena.ptr));
-    _ = arena.reset(.retain_capacity);
-
+    self.page._session.arena_pool.resetRetain(self.arena);
     self.rules = try .initCapacity(self.arena, item_count);
     const sheets = self.page.document._style_sheets orelse return;
     for (sheets._sheets.items) |sheet| {