Extend copy to clipborad function to support customized mime types

[Leilei332]

Related to #7208 and #8613. An attempt to extend tw's copy to clipboard function to support setting the mime type of the copied text. Macros and widget messages are also updated.

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Confirmed: Leilei332 has already signed the Contributor License Agreement (see contributing.md)

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[pmario]

Can you be more specific, how this should be used. I am not sure if it works as expected. See: https://alexharri.com/blog/clipboard

[Leilei332]

Using the function in javascript, which copys html with text/html mime type:

$tw.utils.copyToClipboard("<em>Test</em>", {}, "text/html");

Using the macro:

<<copy-to-clipboard src:"<em>Test</em>" type:"text/html">>

[Leilei332]

Try this one in the preview. Click the copy to clipboard button and press ctrl+v, the tiddlers should be displayed in the importer:

<$transclude $variable="copy-to-clipboard" src=<<jsontiddlers filter:"[tag[Concepts]]">> type="text/vnd.tiddler"/>

The dropzone widget turned out to be able to parse the data saved in text/vnd.tiddler in the clipboard.

[Jermolene]

Great thanks @Leilei332, looks good, and very useful. We will need a documentation update as well.

[Jermolene]

Great, thanks @Leilei332

[pmario]

@Leilei332 -- Which browsers did you test this with? -- I did test it with Edge Windows and it seems it only handles the text/plain buffer.

[Leilei332]

@Leilei332 -- Which browsers did you test this with? -- I did test it with Edge Windows and it seems it only handles the text/plain buffer.

That's strange. I tested it on firefox 128, chrome 132 and edge 132 on Windows 10, they all worked well.

[pmario]

Did you test with https://tiddlywiki.com/prerelease or from localhost? ... I did test with localhost ... May be there is a difference. More testing will be needed.