Add necessary methods to NSIndexPath to support NSCollectionView with layouts. Needed item,section information in NSIndexPath object

Headers/Foundation/NSIndexPath.h

@@ -50,6 +50,9 @@ GS_EXPORT_CLASS
   NSUInteger	_hash;
   NSUInteger	_length;
   NSUInteger	*_indexes;
+  
+  NSInteger     _item;
+  NSInteger     _section;
 #endif
 #if     GS_NONFRAGILE
 #else
@@ -72,6 +75,23 @@ GS_EXPORT_CLASS
  */
 + (id) indexPathWithIndexes: (NSUInteger*)indexes length: (NSUInteger)length;
 
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_11,GS_API_LATEST)
+/**
+ * Return a path containing an item number and section.
+ */
++ (NSIndexPath *) indexPathForItem: (NSInteger)item inSection: (NSInteger)section;
+
+/**
+ * Return an index number identifying an item in a collection view
+ */
+- (NSInteger) item;
+
+/**
+ * Return an index number identifying a section in a collection view
+ */
+- (NSInteger) section;
+#endif
+  
 /**
  * Compares other with the receiver.<br />
  * Returns NSOrderedSame if the two are identical.<br />

Source/NSIndexPath.m

@@ -40,6 +40,27 @@ static	Class		myClass = 0;
 static	NSIndexPath	*empty = nil;
 static	NSIndexPath	*dummy = nil;
 
+@interface NSIndexPath (__GNUstepPrivate__)
+
+- (void) _setSection: (NSInteger)section;
+- (void) _setItem: (NSInteger)item;
+
+@end
+
+@implementation NSIndexPath (__GNUstepPrivate__)
+
+- (void) _setSection: (NSInteger)section
+{
+  _section = section;
+}
+
+- (void) _setItem: (NSInteger)item
+{
+  _item = item;
+}
+
+@end
+
 @implementation	NSIndexPath
 
 + (id) allocWithZone: (NSZone*)aZone
@@ -64,6 +85,16 @@ static	NSIndexPath	*dummy = nil;
   return AUTORELEASE(o);
 }
 
++ (NSIndexPath *) indexPathForItem: (NSInteger)item inSection: (NSInteger)section;
+{
+  id o = [self allocWithZone: NSDefaultMallocZone()];
+
+  [o _setItem: item];
+  [o _setSection: section];
+
+  return AUTORELEASE(o);
+}
+
 + (void) initialize
 {
   if (empty == nil)
@@ -198,6 +229,16 @@ static	NSIndexPath	*dummy = nil;
     }
 }
 
+- (NSInteger) item
+{
+  return _item;
+}
+
+- (NSInteger) section
+{
+  return _section;
+}
+
 - (void) getIndexes: (NSUInteger*)aBuffer
 {
   memcpy(aBuffer, _indexes, _length * sizeof(NSUInteger));