Issue #146 - Part 1: Draw each table's background on their own display

list items.

This patch does the following things:
1. Creates nsDisplayTableBorderCollapse that draws all collapse border
of tables.
2. Stops the use of nsDisplayTableBorderBackground.
3. Lets column and column group frames generate display items.
4. When traversing the table, also traverses the column and column group
frames.
5. For each type of table frame (col group, col, row group, row and
cell), draws their own background.

1 files changed, 1 insertions, 4 deletions

diff --git a/layout/tables/nsTableColGroupFrame.h b/layout/tables/nsTableColGroupFrame.h
index 2a25fdc44..b3dfb94e7 100644
--- a/layout/tables/nsTableColGroupFrame.h
+++ b/layout/tables/nsTableColGroupFrame.h
@@ -43,12 +43,9 @@ public:
     return static_cast<nsTableFrame*>(parent);
   }
 
-  /**
-   * ColGroups never paint anything, nor receive events.
-   */
   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
-                                const nsDisplayListSet& aLists) override {}
+                                const nsDisplayListSet& aLists) override;
 
   /** A colgroup can be caused by three things:
     * 1)	An element with table-column-group display