Ability to create vector scratch layer for editing purposes

[jpalmer]

I would like the ability to create a vector scratch layer for storing temporary features that are in the process of being edited.

For example I have two layers. The first contain source polygon features, the second contains features that are derived (i.e. union/merged) and copied features from the first. The problem is that if you copy feature directly from the first to the second, selections for the merge become hard due to other features already in the second layer.

A good solution would be to have a “temporary in memory” edit layer which you can copy the feature into, complete geometry operations in, and then copy to the final destination layer.

Maybe exposing the memory provider in the new layer dialog is enough?