We have a issue where customers are creating duplicate quotes with different numbers. Problem is caused when users double click on Add New (+) button. It is highlighted below in pic.

I think it is OOB functionality, is there any solution to fix this issue?
Initially I thought of creating a custom button which will check a flag before calling OOB JavaScript function. But I think double click happens to fast and flag will not be set/checked with-in that time.
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