Dictation glow can be rendered exceeding graphics context bounds

https://bugs.webkit.org/show_bug.cgi?id=258960
<radar://111867549>

Reviewed by Kimmo Kinnunen.

We should never set the clip rectangle to something larger than the
initial graphics context bounds, since we won't render to an area
larger than that and the contents will be left stale.

Correct this by clipping to the initial clip rectangle whenever the clip
rectangle is reset.

* Source/WebCore/platform/graphics/displaylists/DisplayListRecorder.cpp:
(WebCore::DisplayList::Recorder::resetClip):
We were already setting the clip bounds to this value a few lines above.

* Tools/TestWebKitAPI/Tests/WebCore/DisplayListRecorderTests.cpp:
Update test expectation.

Canonical link: https://commits.webkit.org/265851@main

Source/WebCore/platform/graphics/displaylists/DisplayListRecorder.cpp

@@ -558,6 +558,7 @@ void Recorder::resetClip()
     currentState().clipBounds = m_initialClip;
 
     recordResetClip();
+    clip(m_initialClip);
 }
 
 void Recorder::clip(const FloatRect& rect)

Tools/TestWebKitAPI/Tests/WebCore/DisplayListRecorderTests.cpp

@@ -286,7 +286,9 @@ struct ResetClipRect {
     static String description()
     {
         return R"DL(
-(reset-clip))DL"_s;
+(reset-clip)
+(clip
+  (rect at (0,0) size 77x88)))DL"_s;
     }
 };