Not sure if this is the right place for such a question but here goes...

If I were to fix a bug or bug(s) in Plasma 4.x, would I still be able to do a pull request, and would it be able to go into mainline Plasma 4.x?
Basically, if I were to take on the job of continuing support for Plasma/KDE 4.x would I be able to submit changes to the Plasma developers, or would I have to fork and start a new project, like the Trinity Desktop?

I'd say if you don't want to waste your time, try to reproduce any bug you find in Plasma-4 with Plasma-5 and fix it there.

Plasma-4 was not released in 2 years, Qt-4 was not released for even longer, everyone is trying to get as far away from Qt-4 and the swiss cheese that is Qt4WebKit security for as far as possible.

You might check in with one of the distros out there still using KDE 4 (Rosa or Porteus among others, for example) and ask how they deal with fixes they want to push upstream (assuming they want to push any).

dequire wrote:You might check in with one of the distros out there still using KDE 4 (Rosa or Porteus among others, for example) and ask how they deal with fixes they want to push upstream (assuming they want to push any).

The kde-workspace.git repository, which contains the sources of Plasma 4.x (split in more repositories for Plasma 5.x) is closed for writing. So the best thing to do is move forward.