From a2fc4b1d2e6083cbedff653d2a6618b8c4d7997d Mon Sep 17 00:00:00 2001
From: Darren Burns <darrenb900@gmail.com>
Date: Wed, 11 Sep 2024 14:22:50 +0100
Subject: [PATCH] Copy on write to Rich log if deferring and content is Text
 instance

---
 src/textual/widgets/_rich_log.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/textual/widgets/_rich_log.py b/src/textual/widgets/_rich_log.py
index e33a164768..abe77a2237 100644
--- a/src/textual/widgets/_rich_log.py
+++ b/src/textual/widgets/_rich_log.py
@@ -194,6 +194,8 @@ def write(
         if not self._size_known:
             # We don't know the size yet, so we'll need to render this later.
             # We defer ALL writes until the size is known, to ensure ordering is preserved.
+            if isinstance(content, Text):
+                content = content.copy()
             self._deferred_renders.append(
                 DeferredRender(content, width, expand, shrink, scroll_end)
             )