Copy and paste block causes "Opps, don't know how to load this file!"

[microbit-carlos]

Edit: This happens when there is an image in the clipboard and a user copy/pastes a block in the workspace. https://github.com/microsoft/pxt-microbit/issues/4944#issuecomment-1431216892

---

Describe the bug

I had this occur a couple of times in the past, but it went away fairly quickly (not sure if a number of refreshes or something else fixed it).

Today it seems to occur more consistently, at least on my system, also when using an incognito window. When trying to copy and paste a block with the keyboard it shows this warning.

To Reproduce

This video shows a MakeCode session with the dbg flag, where I simply select a block and press Ctrl+C and Ctrl+V:

https://user-images.githubusercontent.com/29712657/219008747-45748649-a2dd-4fe7-83ad-261675c8b85c.mp4

Expected behavior The warning not to appear.

Screenshots

Included above.

micro:bit version (please complete the following information):

N/A

Desktop (please complete the following information):

• OS: macOS 12 Monterey
• Browser: Chrome
• Version: 109

Smartphone (please complete the following information): N/A

Additional context

makecode.microbit.org version: 5.0.12 Microsoft MakeCode version: 8.0.7 microbit runtime version: v2.2.0-rc6 codal-microbit-v2 runtime version: v0.2.40

[microbit-carlos]

@JohnVidler had a great epiphany about checking my clipboard and I can confirm that this issue is only replicable for me when I have an image (in this case a screenshot) in my clipboard.

[abchatra]

We don't support multiple things in clipboard as we can't load other files

[microbit-carlos]

Right, but Ctrl+C and Ctrl+V a block showing an inexplicable error is not a great user experience.

With the current UX, most users will be confused about what happened (I definitely was), since the block has been copied but MakeCode is showing that error.

• In what kind of situation would other content from the clipboard be used in this MakeCode view?
• If the user has already copied something with Ctrl+C and it's placed in some kind of "virtual clipboard", why is MakeCode still trying to paste from the OS clipboard? shouldn't the Ctrl+V event be aborted in this case (after pasting the block)?

[Jaqster]

@microbit-carlos - I can't reproduce this bug. Just successfully Ctrl+C, Ctrl+V pasted several blocks in the workspace. Can you provide more detailed repro steps?

[microbit-carlos]

Yes, sorry, I should have added the https://github.com/microsoft/pxt-microbit/issues/4944#issuecomment-1431216892 comment to the original message. To trigger the issue you need to have an image in your clipboard.

[abchatra]

May be mac specific. Doesn't repro in the windows machine.

[abchatra]

@carlosperate could reproduce in Mac.

[martinwork]

@abchatra I can repro on Windows in Chrome.

• Find a PNG file on the hard disc
• Select it and Ctrl+C to copy it
• Change to MakeCode editor, select a block, and Ctrl+C, then Ctrl+V

The block is pasted OK, but there is also the "oops" message.