Add improvements suggested by @fredkiefer

Headers/Additions/GNUstepGUI/GSTheme.h

@@ -1335,8 +1335,6 @@ APPKIT_EXPORT_CLASS
 					inView: (NSView *)view
 			      selectingColumns: (BOOL)selectingColumns;
 
-- (BOOL) isBoxOpaque: (NSBox *)box;
-
 - (void) drawTableViewRow: (NSInteger)rowIndex 
 		 clipRect: (NSRect)clipRect
 		   inView: (NSView *)view;
@@ -1349,6 +1347,8 @@ APPKIT_EXPORT_CLASS
                    clipRect: (NSRect)clipRect
 		     inView: (NSView *)view;
 
+- (BOOL) isBoxOpaque: (NSBox *)box;
+
 - (void) drawBoxInClipRect: (NSRect)clipRect
 		   boxType: (NSBoxType)boxType
 		borderType: (NSBorderType)borderType

Headers/AppKit/NSUserInterfaceItemIdentification.h

@@ -30,7 +30,7 @@
 
 #import <Foundation/NSObject.h>
 
-#if OS_API_VERSION(MAC_OS_X_VERSION_10_13, GS_API_LATEST)
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_7, GS_API_LATEST)
 
 #if	defined(__cplusplus)
 extern "C" {

Source/GSThemeDrawing.m

@@ -3310,8 +3310,6 @@ static NSDictionary *titleTextAttributes[3] = {nil, nil, nil};
   NSIndexSet *selectedRows = [tableView selectedRowIndexes];
   NSIndexSet *selectedColumns = [tableView selectedColumnIndexes];
 
-  // NSColor *backgroundColor = [tableView backgroundColor];
-
   // Set the fill color
   {
     NSColor *selectionColor;
@@ -3385,16 +3383,6 @@ static NSDictionary *titleTextAttributes[3] = {nil, nil, nil};
     }
 }
 
-- (BOOL) isBoxOpaque: (NSBox *)box
-{
-  if ([box boxType] == NSBoxCustom)
-    {
-      return ![box isTransparent];
-    }
-
-  return YES;
-}
-
 - (void) drawTableViewRow: (NSInteger)rowIndex 
 		 clipRect: (NSRect)clipRect
 		   inView: (NSView *)view
@@ -3836,6 +3824,16 @@ static NSDictionary *titleTextAttributes[3] = {nil, nil, nil};
     }
 }
 
+- (BOOL) isBoxOpaque: (NSBox *)box
+{
+  if ([box boxType] == NSBoxCustom)
+    {
+      return ![box isTransparent];
+    }
+
+  return YES;
+}
+
 - (void) drawBoxInClipRect: (NSRect)clipRect
 		   boxType: (NSBoxType)boxType
 		borderType: (NSBorderType)borderType

Source/NSOutlineView.m

@@ -2158,7 +2158,7 @@ Also returns the child index relative to this parent. */
 {
   NSCell *cell = nil;
 
-  if (_viewBased)
+  if (_viewBased == NO)
     {
       NSTableColumn *tb = [_tableColumns objectAtIndex: columnIndex];
       

Source/NSTableColumn.m

@@ -74,17 +74,6 @@
 #import "GSBindingHelpers.h"
 
 
-// Private method on NSTableView to register views...
-@interface NSTableView (NSTableColumnPrivate)
-- (void) _registerView: (NSView *)view;
-@end
-
-@implementation NSTableView (NSTableColumnPrivate)
-- (void) _registerView: (NSView *)view
-{
-}
-@end
-
 /**
   <p>
   NSTableColumn objects represent columns in NSTableViews.  
@@ -483,17 +472,6 @@ to YES. */
   ASSIGN(_sortDescriptorPrototype, aSortDescriptor);
 }
 
-- (void) _registerPrototypes
-{
-  NSEnumerator *en = [_prototypeCellViews objectEnumerator];
-  NSView *v = nil;
-
-  while ((v = [en nextObject]) != nil)
-    {
-      [_tableView _registerView: v];
-    }
-}
-
 /*
  * Encoding/Decoding
  */
@@ -602,7 +580,6 @@ to YES. */
       if ([aDecoder containsValueForKey: @"NSPrototypeCellViews"])
 	{
 	  ASSIGN(_prototypeCellViews, [aDecoder decodeObjectForKey: @"NSPrototypeCellViews"]);
-	  [self _registerPrototypes];
 	}
     }
   else
@@ -633,7 +610,6 @@ to YES. */
 	  if (version >= 4)
 	    {
 	      _prototypeCellViews = RETAIN([aDecoder decodeObject]);
-	      [self _registerPrototypes];
 	    }
         }
       else