Add more ways to copy the currently opened file

[peytondmurray]

References

Closes #12099.

Code changes

• Adds a new docmanager:duplicate command for duplicating a file

User-facing changes

Adds 3 new ways to duplicate the currently opened file to the UI:

• Through the context menu that opens when right clicking on an opened tab
• Via a new entry in the File menu
• Using the command palette

which are the 3 ways of duplicating an opened file proposed in the original issue.

Context menu entry:

File menu entry:

Command palette entry:

Backwards-incompatible changes

None

[jupyterlab-probot]

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[krassowski]

bot please update snapshots

[krassowski]

Two of the screenshots got updated but should not have:

• debugger-kernel-documentation-linux.png
• file-formats-nteract-vdom-documentation-linux.png

@peytondmurray I will merge your branch with master and re-run snapshot bot to see if these were due to something which was already fixed.

[peytondmurray]

👍 Thanks @krassowski, it looks like that did the trick!

[krassowski]

Well, c3f6667 did it. Surprisingly the visual regression tests for documentation work about as well with and without that commit. I guess that it could be because of lenient retry settings: the snapshots are taken by the bot when the kernel is still busy / SVG comic has not finished loading and they pass the regression tests in one of the allowed retries; the tracked snapshots are taken after loading finished and they also pass the tests in one of the retries.

Edit: I left my feedback in the original issue: #12099 (comment).

[fcollonval]

bot please update galata snapshots

[fcollonval]

Kicking CI

[krassowski]

LGTM