From cccb1b9c5fbbfc60213aa98cbfd6afba8a43baa0 Mon Sep 17 00:00:00 2001
From: Eric-Guo <eric.guocz@gmail.com>
Date: Sat, 17 Jan 2026 12:25:47 +0800
Subject: [PATCH] Added a Windows-only guard that makes window.getComputedStyle
 fall back to document.documentElement when a non-Element slips through, which
 prevents Floating UI (used by Kobalte tooltips/popovers) from throwing in
 WebView2 after message submit.

---
 packages/desktop/src/index.tsx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packages/desktop/src/index.tsx b/packages/desktop/src/index.tsx
index 7a46ba8cde0..8398f457766 100644
--- a/packages/desktop/src/index.tsx
+++ b/packages/desktop/src/index.tsx
@@ -26,6 +26,18 @@ if (import.meta.env.DEV && !(root instanceof HTMLElement)) {
   )
 }
 
+const isWindows = ostype() === "windows"
+if (isWindows) {
+  const originalGetComputedStyle = window.getComputedStyle
+  window.getComputedStyle = ((elt: Element, pseudoElt?: string | null) => {
+    if (!(elt instanceof Element)) {
+      // WebView2 can call into Floating UI with non-elements; fall back to a safe element.
+      return originalGetComputedStyle(document.documentElement, pseudoElt ?? undefined)
+    }
+    return originalGetComputedStyle(elt, pseudoElt ?? undefined)
+  }) as typeof window.getComputedStyle
+}
+
 let update: Update | null = null
 
 const createPlatform = (password: Accessor<string | null>): Platform => ({