iOS/WAStickersThirdParty/YYAnimatedImageView.m [435:443]:
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        NSNumber *next = @((_curIndex + 1) % _totalFrameCount);
        LOCK(
             NSArray *keys = _buffer.allKeys;
             for (NSNumber *key in keys) {
                 if (![key isEqualToNumber:next]) { // keep the next frame for smoothly animation
                     [_buffer removeObjectForKey:key];
                 }
             }
        )//LOCK
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iOS/WAStickersThirdParty/YYAnimatedImageView.m [449:457]:
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    NSNumber *next = @((_curIndex + 1) % _totalFrameCount);
    LOCK(
         NSArray *keys = _buffer.allKeys;
         for (NSNumber *key in keys) {
             if (![key isEqualToNumber:next]) { // keep the next frame for smoothly animation
                 [_buffer removeObjectForKey:key];
             }
         }
     )//LOCK
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