From 5536c4ac5196888ddb7436d302dc30239174e807 Mon Sep 17 00:00:00 2001
From: GitHub Copilot <copilot@github.com>
Date: Sat, 24 Jan 2026 11:59:23 +0000
Subject: [PATCH] Invalidate screenshot cache on terminal resize

When terminal resizes, old screenshot content is stale until
the app (tmux etc) re-renders at new dimensions. Clear cache
to force re-capture after resize.
---
 src/textual_webterm/local_server.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/textual_webterm/local_server.py b/src/textual_webterm/local_server.py
index abdbb52..4a4beda 100644
--- a/src/textual_webterm/local_server.py
+++ b/src/textual_webterm/local_server.py
@@ -388,6 +388,9 @@ class LocalServer:
             await self._create_terminal_session(route_key, width, height)
             return True
         await session_process.set_terminal_size(width, height)
+        # Invalidate screenshot cache on resize - content needs to re-render
+        self._screenshot_cache.pop(route_key, None)
+        self._screenshot_cache_etag.pop(route_key, None)
         return False
 
     async def _handle_ping(