Textarea resize-able only to larger; min-height and min-width properly set

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index a89c991de7871f0d964197188dea146590fa9c87..ab372bf195cfadbd4ac0c6221ad7bfa2efc0c6e4 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -75,6 +75,11 @@ namespace WebCore {
 
 const int ResizerControlExpandRatioForTouch = 2;
 
+// Default value is set to 15 as the default
+// minimum size used by firefox is 15x15.
+static const int defaultMinimumWidthForResizing = 15;
+static const int defaultMinimumHeightForResizing = 15;
+
 RenderLayerScrollableArea::RenderLayerScrollableArea(RenderLayer& layer)
     : m_layer(layer)
     , m_inResizeMode(false)
@@ -722,6 +727,16 @@ static bool overflowDefinesAutomaticScrollbar(EOverflow overflow)
     return overflow == OAUTO || overflow == OOVERLAY;
 }
 
+IntSize RenderLayerScrollableArea::minimumSizeForResizing()
+{
+    int minimumWidth = intValueForLength(box().style()->logicalMinWidth(), box().containingBlock()->logicalWidth());
+    int minimumHeight = intValueForLength(box().style()->logicalMinHeight(), box().containingBlock()->logicalHeight());
+
+    minimumWidth = std::max(minimumWidth, defaultMinimumWidthForResizing);
+    minimumHeight = std::max(minimumHeight, defaultMinimumHeightForResizing);
+    return IntSize(minimumWidth, minimumHeight);
+}
+
 void RenderLayerScrollableArea::updateAfterStyleChange(const RenderStyle* oldStyle)
 {
     // List box parts handle the scrollbars by themselves so we have nothing to do.
@@ -1380,8 +1395,6 @@ void RenderLayerScrollableArea::resize(const PlatformEvent& evt, const LayoutSiz
     newOffset.setHeight(newOffset.height() / zoomFactor);
 
     LayoutSize currentSize = LayoutSize(box().width() / zoomFactor, box().height() / zoomFactor);
-    LayoutSize minimumSize = element->minimumSizeForResizing().shrunkTo(currentSize);
-    element->setMinimumSizeForResizing(minimumSize);
 
     LayoutSize adjustedOldOffset = LayoutSize(oldOffset.width() / zoomFactor, oldOffset.height() / zoomFactor);
     if (box().style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft()) {
@@ -1389,7 +1402,7 @@ void RenderLayerScrollableArea::resize(const PlatformEvent& evt, const LayoutSiz
         adjustedOldOffset.setWidth(-adjustedOldOffset.width());
     }
 
-    LayoutSize difference = (currentSize + newOffset - adjustedOldOffset).expandedTo(minimumSize) - currentSize;
+    LayoutSize difference = (currentSize + newOffset - adjustedOldOffset).expandedTo(minimumSizeForResizing()) - currentSize;
 
     bool isBoxSizingBorder = box().style()->boxSizing() == BORDER_BOX;