[Webkit-unassigned] [Bug 236061] [WinCairo] transparent scrollbar layer doesn't repaint correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236061

--- Comment #3 from Fujii Hironori <Hironori.Fujii at sony.com> ---
In GTK port, the background of the custom scrollbar is always black, because it clears color buffers with black.
It doesn't have the repainting issue because it clears the background for every frames.
If I disable it, it also has the same issue with WinCairo.

diff --git a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
index 57537cf53881..2f133b10e61f 100644
--- a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
+++ b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
@@ -234,7 +234,7 @@ void ThreadedCompositor::renderLayerTree()
         glViewport(0, 0, viewportSize.width(), viewportSize.height());

     glClearColor(0, 0, 0, 0);
-    glClear(GL_COLOR_BUFFER_BIT);
+    //glClear(GL_COLOR_BUFFER_BIT);

     m_scene->applyStateChanges(states);
     m_scene->paintToCurrentGLContext(viewportTransform, FloatRect { FloatPoint { }, viewportSize }, m_paintFlags);

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