Copy-pasting nodes

[vitvakatu]

Pull Request Description

Closes #6261

• Adds support for copy-pasting nodes with cmd + C and cmd + V shortcuts.
• Only a single, currently selected node will be copied. Adding support for multiple node copies seems easy, though (but was out of the scope of the task).
• We use a custom data format for clipboard content. Node's metadata is also copied, so opened visualizations are preserved. However, the visualization's size is not preserved, as we do not store this info in metadata.
• For custom format to work, we use a pretty new feature called Clipboard pickling, but it is available in Electron and in most browsers already.
• Pasting plain text from other applications (or from Enso, if the code is copied in edit mode) is supported and is currently enabled. There are some security concerns related to this, though. I will create a separate issue/discussion for that.
• Undo/redo works as you expect.
• New node is pasted at the cursor position.

Kapture.2023-08-21.at.13.37.40.mp4

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[kazcw]

Docs accurate?

[vitvakatu]

Yep, it's still not typical to use it, but in this case we need it.

[vitvakatu]

On the demo, we discussed that it would be nice to copy nodes to external programs as plain text, but it turns out to be quite hard to implement, as multiple clipboard items are not supported on most platforms: https://bugs.chromium.org/p/chromium/issues/detail?id=1171260.

So we either need to step back from this feature, which is bad, or use plain text format, which is also bad, as we won't be able to copy metadata and do other cool things in the future. I need to research how it is done in other programs, as I can clearly copy syntax highlighting from some editors and at the same time operate with copied code as with plain text in other programs.

@wdanilo, what do you think?

1171260 -

chromium -

An open-source project to help move the web forward. -

Monorail

[vitvakatu]

Ok, let's merge this one, and let's think about external apps support in a separate issue.

[vitvakatu]

Thanks to @Frizi for helping with the investigation. Turns out I was confused by the documentation. Added support for pasting to external programs as plain text.

[MichaelMauderer]

QA: 🔴

When pasting a node while zoomed out, it is created in the wrong position.

Some additional smaller UX items thing that I noticed

• When pasting illegal input (multiple lines, invalid identifiers), there is an error in the console, but not to the user. It might be good to show a user-facing error explaining why nothing is happening.
  
• When pasting multiple times without moving the cursor, the items are created exactly on top of one another. This seems undesirable as it hides potential user error (accidental double key press).
  

[vitvakatu]

All issues were addressed.

[farmaazon]

QA Report: 🟢

Issues fixed, no more found.