From 77e82d91e41d859aaf6a7b36a77f4ab945caade9 Mon Sep 17 00:00:00 2001
From: brian-reichle <18721383+brian-reichle@users.noreply.github.com>
Date: Sun, 8 Jun 2025 21:28:19 +1000
Subject: [PATCH] Ensure capacity before pinning span.

---
 src/TextTools/StringBuilderSpanExtensions.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/TextTools/StringBuilderSpanExtensions.cs b/src/TextTools/StringBuilderSpanExtensions.cs
index 7b7c8e8..e76c70a 100644
--- a/src/TextTools/StringBuilderSpanExtensions.cs
+++ b/src/TextTools/StringBuilderSpanExtensions.cs
@@ -19,6 +19,10 @@ public static StringBuilder Append(this StringBuilder builder, ReadOnlySpan<char
 #if NET || NETSTANDARD2_1_OR_GREATER
 			return builder.Append(span);
 #else
+			// Ensure there will be enough capacity for the span before pinning,
+			// to reduce the risk of triggering a GC while span is pinned.
+			builder.EnsureCapacity(builder.Length + span.Length);
+
 			unsafe
 			{
 				fixed (char* ptr = span)