Allow copying of items from read-only file

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe.
In draw.io v23, it was possible to copy items from a read-only file. In v24 and beyond, selecting and copying objects is disabled and only "Copy as Image" is possible. Our workflow was to copy items from a file that contained standardized elements and paste them into a read/write working file in another draw.io window.

Describe the solution you'd like
Allow items in read-only documents to be selected and copied to the clipboard. (I understand that editing a read-only file is not allowed and agree that it should not be allowed. I am only requesting the ability to Copy items.)

Describe alternatives you've considered
I tried creating a Library, but this appears to be intended for shapes. My read-only sheet contains grouped/compound items which I don't believe can be represented as a shape.

Additional context
Screen capture illustrating a standardized element which we'd like to be able to copy from a read-only file.

Start by reproducing the behavior in draw.io v24 or later with a read-only document containing grouped or compound items, then compare it with v23. The change is done when items in read-only documents can be selected and copied to the clipboard, while editing remains disabled and “Copy as Image” continues to work.