[Webkit-unassigned] [Bug 222657] adoptNode() discards native shadow DOM roots, breaking several input and media elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222657

--- Comment #7 from Ryosuke Niwa <rniwa at webkit.org> ---
This is the fix:

diff --git a/Source/WebCore/html/HTMLMediaElement.cpp b/Source/WebCore/html/HTMLMediaElement.cpp
index e1d903331b07..291964180f72 100644
--- a/Source/WebCore/html/HTMLMediaElement.cpp
+++ b/Source/WebCore/html/HTMLMediaElement.cpp
@@ -4290,7 +4290,10 @@ void HTMLMediaElement::ensureMediaControlsShadowRoot()
         return;

     m_creatingControls = true;
-    ensureUserAgentShadowRoot();
+    if (auto shadowRoot = userAgentShadowRoot(); shadowRoot && !shadowRoot->hasChildNodes())
+        didAddUserAgentShadowRoot(*shadowRoot);
+    else
+        ensureUserAgentShadowRoot();
     m_creatingControls = false;
 }

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