Document will be implemented for the new IDE. But probably not before end of june or july.

@jleben
is this method going to implemented?

@seansay, I don't see time for this in my schedule at least until late summer.

@jleben
sorrry that I'm new to the the codebase here, could you point me to the source related to the issue? I'm really hope trying to contribute to the codebase

On the master branch, there is already the beginning of ScIDEDocument implementation at:
https://github.com/supercollider/supercollider/blob/master/SCClassLibrary/scide_scqt/ScIDE.sc

You'd need to implement various methods in ScIDEDocument, to use the method ScIDE:*prSend in order to send commands to the IDE.

Then you'd need to implement functionality in the C++ code of the IDE to handle those commands, e.g. for modifying the text in the current document, etc.... See for example HelpBrowser::onScResponse method here:
https://github.com/supercollider/supercollider/blob/master/editors/sc-ide/widgets/help_browser.cpp

I'd need to know what functionality precisely you'd want to implement in order to give you more detailed advice.

@miguel-negrao You okay closing this, since the Document class was revived? Is there still missing functionality?

For 3.7 it is fine. We'll need a more particular issue for individual features.