From c81c51d51094bfb15a0cc914d84fc9ae78aa7e45 Mon Sep 17 00:00:00 2001
From: Brian Vaughn <brian.david.vaughn@gmail.com>
Date: Fri, 12 Sep 2025 08:03:28 -0400
Subject: [PATCH] Fix Firefox drag bug

---
 .../src/PanelResizeHandleRegistry.ts                       | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/react-resizable-panels/src/PanelResizeHandleRegistry.ts b/packages/react-resizable-panels/src/PanelResizeHandleRegistry.ts
index 77992071c..53c424a4b 100644
--- a/packages/react-resizable-panels/src/PanelResizeHandleRegistry.ts
+++ b/packages/react-resizable-panels/src/PanelResizeHandleRegistry.ts
@@ -120,7 +120,12 @@ function handlePointerMove(event: PointerEvent) {
 
   // Edge case (see #340)
   // Detect when the pointer has been released outside an iframe on a different domain
-  if (isPointerDown && event.buttons === 0) {
+  if (
+    isPointerDown &&
+    // Skip this check for "pointerleave" events, else Firefox triggers a false positive (see #514)
+    event.type !== "pointerleave" &&
+    event.buttons === 0
+  ) {
     isPointerDown = false;
 
     updateResizeHandlerStates("up", event);