[Regression] Fix Draggable is float:left and container is overflow:hidden

Source/core/rendering/InlineFlowBox.cpp

Index: Source/core/rendering/InlineFlowBox.cpp
diff --git a/Source/core/rendering/InlineFlowBox.cpp b/Source/core/rendering/InlineFlowBox.cpp
index 5a263d9ab993ecbce0e9aede687c746789aa5438..29646b7702e443f55879940e40f69d1ca32e6e1b 100644
--- a/Source/core/rendering/InlineFlowBox.cpp
+++ b/Source/core/rendering/InlineFlowBox.cpp
@@ -1142,12 +1142,17 @@ void InlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset,
         return;
 
     PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
-    PaintInfo childInfo(paintInfo);
-    childInfo.phase = paintPhase;
-    childInfo.updatePaintingRootForChildren(&renderer());
 
     // Paint our children.
     if (paintPhase != PaintPhaseSelfOutline) {
+        PaintInfo childInfo(paintInfo);
+        childInfo.phase = paintPhase;
+
+        if (childInfo.paintingRoot && childInfo.paintingRoot->isDescendantOf(&renderer()))
+            childInfo.paintingRoot = 0;
+        else
+            childInfo.updatePaintingRootForChildren(&renderer());
+
         for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
             if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
                 curr->paint(childInfo, paintOffset, lineTop, lineBottom);