[w3c/clipboard-apis] Proposal: Identifying whether the clipboard has changed without re-reading it (Issue #232)

Hi,  
I’d like to propose an addition to the Clipboard API \- a way to efficiently check whether the clipboard has changed between two points in time without actually reading it. The primary use case that I have in mind would be to optimize the remote desktop solutions’ heuristics for local clipboard change detection. Another potential use case could be within the web versions of office-like applications, as they usually integrate context menus with information on what currently exists in the clipboard \- the exact interest of their developers in this however remains to be determined.  
You can find a more detailed explainer at [https://github.com/explainers-by-googlers/clipboard-contents-id](https://github.com/explainers-by-googlers/clipboard-contents-id). Could we schedule a discussion at an upcoming meeting to figure out:

1. Is there consensus to address this problem?  
2. If not, what extra data could help show that the use case is important?  
3. If the use case does have consensus:  
    1\. Can we check the explainer into [https://github.com/w3c/clipboard-apis](https://github.com/w3c/clipboard-apis)?  
    2\. What concerns do people have about the proposed API shape?  
    3\. How should this interact with the proposed `clipboardchange` event?


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