What part of the code is related to Release Confirms in node editors?

I use “Release Confirms” disabled/unchecked box because I consider it useful for 3D viewport. But in Master this also has influence on node editors, which I consider a very annoying behavior.

Which part of the Blender code is related to this, and how could I modify the code and build blender so that the behavior is similar to 2.79/2.80?