Elliminate duplicates in clipboard list

[ffMathy]

We should detect and elliminate duplicate entries, and perhaps merge them (if there is a rich text representation in one but not the other, but the visual representation is the same, we merge the rich text and the normal representation into one clipboard package).

[thegabrielstein]

Very good idea (it was implemented in v5?) as long as the detection is pretty dependable so it doesn't overwrite a different version of item since copying multiple slightly different versions of something is quite common. Eg copying a sentence of text before and after a type correction.

Potentially use a hash or Distinct type function would be great as long as it's trustworthy.

[ffMathy]

Wow, I just had an idea... For items that are very similar, what if we could highlight a diff in bold of the text that stands out!

That would be very cool.

[ffMathy]

This is currently being worked on.

[ffMathy]

In PR #571 I have now added a hash mechanism for all clipboard data types. It will be able to determine a hash for every clipboard content, to find duplicates.

Still need to implement the duplication ellimination, but that should be easy, so I am almost done!