Don't throw Objective C exception when quitting MacVim

src/MacVim/MMAppController.m

@@ -759,6 +759,15 @@ - (void)applicationWillTerminate:(NSNotification *)notification
                                  andEventID:'MOD '];
 #endif
 
+    // We are hard shutting down the app here by terminating all Vim processes
+    // and then just quit without cleanly removing each Vim controller. We
+    // don't want the straggler controllers to still interact with the now
+    // invalid connections, so we just mark them as uninitialized.
+    for (NSUInteger i = 0, count = [vimControllers count]; i < count; ++i) {
+        MMVimController *vc = [vimControllers objectAtIndex:i];
+        [vc uninitialize];
+    }
+
     // This will invalidate all connections (since they were spawned from this
     // connection).
     [connection invalidate];

src/MacVim/MMVimController.h

@@ -57,6 +57,7 @@
 }
 
 - (id)initWithBackend:(id)backend pid:(int)processIdentifier;
+- (void)uninitialize;
 - (unsigned)vimControllerId;
 - (id)backendProxy;
 - (int)pid;

src/MacVim/MMVimController.m

@@ -248,6 +248,15 @@ - (void)dealloc
     [super dealloc];
 }
 
+/// This should only be called by MMAppController when it's doing an app quit.
+/// We just wait for all Vim processes to terminate instad of individually
+/// closing each MMVimController. We simply unset isInitialized to prevent it
+/// from handling and sending messages to now invalid Vim connections.
+- (void)uninitialize
+{
+    isInitialized = NO;
+}
+
 - (unsigned)vimControllerId
 {
     return identifier;