nsTableCellMap::InsertRows shouldn't make damage area smaller, b=244135 p=malcolm.parsons r+sr=bz a=roc

layout/reftests/bugs/reftest.list

@@ -101,6 +101,7 @@ fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 28811-2a.html 28811-2-ref.html # bug 38
 == 243266-1.html 243266-1-ref.html
 == 243302-1.html 243302-1-ref.html
 == 244135-1.html 244135-1-ref.html
+== 244135-2.html 244135-2-ref.html
 == 244932-1.html 244932-1-ref.html
 == 249982-1.html 249982-1-ref.html
 == 253701-1.html 253701-1-ref.html

layout/tables/nsCellMap.cpp

@@ -565,8 +565,8 @@ nsTableCellMap::InsertRows(nsTableRowGroupFrame& aParent,
     nsTableRowGroupFrame* rg = cellMap->GetRowGroup();
     if (rg == &aParent) {
       cellMap->InsertRows(*this, aRows, rowIndex, aConsiderSpans, aDamageArea);
-      aDamageArea.y = aFirstRowIndex;
-      aDamageArea.height = PR_MAX(0, GetRowCount() - aFirstRowIndex);
+      aDamageArea.y = PR_MIN(aFirstRowIndex, aDamageArea.y);
+      aDamageArea.height = PR_MAX(0, GetRowCount() - aDamageArea.y);
 #ifdef DEBUG_TABLE_CELLMAP 
       Dump("after InsertRows");
 #endif