Add a method to GSDisplayServer that allows you to obtain the

identifier used by the backend's windowing system instead of
just the GNUstep-internal window number. On X11, the identifier
is useful, among other things, to implement the D-Bus menu 
protocol.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@37533 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,9 @@
+2014-01-01 Niels Grewe <niels.grewe@halbordnung.de>
+	* Headers/Additions/GNUstepGUI/GSDisplayServer.h
+	* Source/GSDisplayServer.m:
+	Add a method to get the window identifier used by the
+	backend (instead of just the window number).
+
 2013-12-31  Fred Kiefer <FredKiefer@gmx.de>
 
 	* Headers/AppKit/NSAnimation.h

Headers/Additions/GNUstepGUI/GSDisplayServer.h

@@ -127,6 +127,7 @@ APPKIT_EXPORT NSString *GSScreenNumber;
 - (int) window: (NSRect)frame : (NSBackingStoreType)type : (unsigned int)style
 	      : (int)screen;
 - (void) termwindow: (int)win;
+- (void*)backendIdentifierForWindow: (int)win;
 - (int) nativeWindow: (void *)winref : (NSRect*)frame : (NSBackingStoreType*)type 
                     : (unsigned int*)style : (int*)screen;
 

Source/GSDisplayServer.m

@@ -570,6 +570,11 @@ GSCurrentServer(void)
   [self subclassResponsibility: _cmd];
 }
 
+- (void*)backendIdentifierForWindow: (int)win
+{
+  return win;
+}
+
 /** Create all the backend structures for a reference to a native window and 
     return the extend, backing type, style and screen for that window. */ 
 - (int) nativeWindow: (void *)winref