Fix double paste when releasing modifiers and pressing Return with a non-sticky bezel

AppController.h

@@ -35,6 +35,7 @@
 	SRKeyCodeTransformer        *srTransformer;
 	BOOL						isBezelDisplayed;
 	BOOL						isBezelPinned;
+	NSTimeInterval				lastPasteFromStackTime;
 	NSString					*currentKeycodeCharacter;
     NSDateFormatter*            dateFormat;
 

AppController.m

@@ -883,6 +883,14 @@ - (void)restoreStashedStoreAndUpdate
 - (void)pasteFromStack
 {
 	NSLog(@"pasteFromStack called");
+	// Releasing the modifier keys and pressing Return within a fraction of a second
+	// both trigger a paste, so the same bezel selection would be pasted twice.
+	NSTimeInterval now = [NSDate timeIntervalSinceReferenceDate];
+	if ( now - lastPasteFromStackTime < 0.6 ) {
+		NSLog(@"pasteFromStack ignored - duplicate trigger within 0.6s");
+		return;
+	}
+	lastPasteFromStackTime = now;
 	NSString *content = [flycutOperator getPasteFromStackPosition];
 	if ( nil != content ) {
 		NSLog(@"Content found, adding to pasteboard and preparing to paste: %@", [content substringToIndex:MIN(content.length, 50)]);