XQuartz: Set can_quit to true during a Sparkle-initiated relaunch.

hw/xquartz/X11Application.m

@@ -970,7 +970,7 @@ void X11ApplicationMain (int argc, char **argv, char **envp) {
         fprintf(stderr, "Error initializing xpbproxy\n");
 
 #if XQUARTZ_SPARKLE
-    [[X11App controller] set_check_for_updates_menu_item];
+    [[X11App controller] setup_sparkle];
     [[SUUpdater sharedUpdater] resetUpdateCycle];
 //    [[SUUpdater sharedUpdater] checkForUpdates:X11App];
 #endif

hw/xquartz/X11Controller.h

@@ -39,6 +39,10 @@
 #include "sanitizedCocoa.h"
 #include "xpr/x-list.h"
 
+#ifdef XQUARTZ_SPARKLE
+#include <Sparkle/SUUpdater.h>
+#endif
+
 @interface X11Controller : NSObject
 {
     IBOutlet NSPanel *prefs_panel;
@@ -91,7 +95,8 @@
 - (void) set_window_menu_check:(NSNumber *)n;
 - (void) set_apps_menu:(NSArray *)list;
 #ifdef XQUARTZ_SPARKLE
-- (void) set_check_for_updates_menu_item;
+- (void) setup_sparkle;
+- (void) updater:(SUUpdater *)updater willInstallUpdate:(SUAppcastItem *)update;
 #endif
 - (void) set_can_quit:(OSX_BOOL)state;
 - (void) server_ready;

hw/xquartz/X11Controller.m

@@ -53,10 +53,6 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
-#ifdef XQUARTZ_SPARKLE
-#include <Sparkle/SUUpdater.h>
-#endif
-
 BOOL xquartz_resetenv_display = NO;
 
 @implementation X11Controller
@@ -317,7 +313,7 @@ BOOL xquartz_resetenv_display = NO;
 }
 
 #ifdef XQUARTZ_SPARKLE
-- (void) set_check_for_updates_menu_item {
+- (void) setup_sparkle {
     if(check_for_updates_item)
         return; // already did it...
 
@@ -330,7 +326,15 @@ BOOL xquartz_resetenv_display = NO;
     [check_for_updates_item setTarget:[SUUpdater sharedUpdater]];
     [check_for_updates_item setEnabled:YES];
 
+    // Set X11Controller as the delegate for the updater.
+    [[SUUpdater sharedUpdater] setDelegate:self];
 }
+
+// Sent immediately before installing the specified update.
+- (void)updater:(SUUpdater *)updater willInstallUpdate:(SUAppcastItem *)update {
+    [self set_can_quit:YES];
+}
+
 #endif
 
 - (void) launch_client:(NSString *)filename