Ensure ‘self’ is kept retained

This shouldn’t be necessary, as we have a ‘retainedSelf’ instance variable that isn’t cleared until ‘[self.window close]’ (the last line of the accept: method), nonetheless I am seeing (rare) crashes from this method, and it appears to be reading the ‘self.window’ property in the last line, so adding this extra safety and will monitor crash reports.

Frameworks/OakFilterList/src/OakFilterList.mm

@@ -238,9 +238,10 @@
 
 - (IBAction)accept:(id)sender
 {
-	[[self window] orderOut:self];
-	[self sendAction:nil];
-	[[self window] close];
+	OakFilterWindowController* retainedSelf = self;
+	[retainedSelf.window orderOut:self];
+	[retainedSelf sendAction:nil];
+	[retainedSelf.window close];
 }
 
 - (IBAction)singleClick:(id)sender