Add suppression tick box to termination alert

This will disable the warning about multiple window and tabs.  Tiger
users can access this functionality by setting the user default
MMSuppressTerminationAlert to 1.

src/MacVim/MMAppController.m

@@ -222,6 +222,7 @@ fsEventCallback(ConstFSEventStreamRef streamRef,
 #ifdef INCLUDE_OLD_IM_CODE
         [NSNumber numberWithBool:YES],  MMUseInlineImKey,
 #endif // INCLUDE_OLD_IM_CODE
+        [NSNumber numberWithBool:NO],   MMSuppressTerminationAlertKey,
         nil];
 
     [[NSUserDefaults standardUserDefaults] registerDefaults:dict];
@@ -509,7 +510,8 @@ fsEventCallback(ConstFSEventStreamRef streamRef,
             reply = NSTerminateCancel;
 
         [alert release];
-    } else {
+    } else if (![[NSUserDefaults standardUserDefaults]
+                                boolForKey:MMSuppressTerminationAlertKey]) {
         // No unmodified buffers, but give a warning if there are multiple
         // windows and/or tabs open.
         int numWindows = [vimControllers count];
@@ -530,6 +532,9 @@ fsEventCallback(ConstFSEventStreamRef streamRef,
             [alert setMessageText:NSLocalizedString(
                     @"Are you sure you want to quit MacVim?",
                     @"Quit dialog with no changed buffers, title")];
+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
+            [alert setShowsSuppressionButton:YES];
+#endif
 
             NSString *info = nil;
             if (numWindows > 1) {
@@ -559,6 +564,13 @@ fsEventCallback(ConstFSEventStreamRef streamRef,
             if ([alert runModal] != NSAlertFirstButtonReturn)
                 reply = NSTerminateCancel;
 
+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
+            if ([[alert suppressionButton] state] == NSOnState) {
+                [[NSUserDefaults standardUserDefaults]
+                            setBool:YES forKey:MMSuppressTerminationAlertKey];
+            }
+#endif
+
             [alert release];
         }
     }

src/MacVim/Miscellaneous.h

@@ -52,6 +52,7 @@ extern NSString *MMLastWindowClosedBehaviorKey;
 #ifdef INCLUDE_OLD_IM_CODE
 extern NSString *MMUseInlineImKey;
 #endif // INCLUDE_OLD_IM_CODE
+extern NSString *MMSuppressTerminationAlertKey;
 
 
 // Enum for MMUntitledWindowKey

src/MacVim/Miscellaneous.m

@@ -44,6 +44,7 @@ NSString *MMLastWindowClosedBehaviorKey = @"MMLastWindowClosedBehavior";
 #ifdef INCLUDE_OLD_IM_CODE
 NSString *MMUseInlineImKey              = @"MMUseInlineIm";
 #endif // INCLUDE_OLD_IM_CODE
+NSString *MMSuppressTerminationAlertKey = @"MMSuppressTerminationAlert";