Fix alignment of <input> elements with overflow

Source/core/rendering/RenderTextControl.h

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 46 matching lines @@
     static bool hasValidAvgCharWidth(AtomicString family);
     virtual float getAvgCharWidth(AtomicString family);
     virtual LayoutUnit preferredContentLogicalWidth(float charWidth) const = 0;
     virtual LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const = 0;
     virtual RenderStyle* textBaseStyle() const = 0;
 
     virtual void updateFromElement();
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
     virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&);
 
+    // We need to override this function because we don't want overflow:hidden on an <input>
+    // to affect the baseline calculation. This is necessary because we are an inline-block
+    // element as an implementation detail which would normally be affected by this.
+    virtual int inlineBlockBaseline(LineDirectionMode direction) const OVERRIDE { return lastLineBoxBaseline(direction); }
+
 private:
     virtual const char* renderName() const { return "RenderTextControl"; }
     virtual bool isTextControl() const { return true; }
     virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
     virtual void computePreferredLogicalWidths() OVERRIDE;
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
     virtual bool avoidsFloats() const { return true; }
     virtual bool canHaveGeneratedChildren() const OVERRIDE { return false; }
     virtual bool canBeReplacedWithInlineRunIn() const OVERRIDE;
@@ skipping 39 matching lines @@
     }
     virtual int firstLineBoxBaseline() const OVERRIDE { return RenderBlock::firstLineBoxBaseline(); }
     virtual int inlineBlockBaseline(LineDirectionMode direction) const OVERRIDE { return lastLineBoxBaseline(direction); }
     virtual bool supportsPartialLayout() const OVERRIDE { return false; }
 };
 
 
 } // namespace WebCore
 
 #endif // RenderTextControl_h