Add "New Screenshot" Button
In 3.26 (and I assume 3.30 as well) once you have a screenshot taken, there is no easy way to take another screenshot. The "Snipping Tool" in Windows solves this quite nicely by just having a "New" button in the toolbar.
I often run into the issue of having to take two or three cutouts of the screen for documentation purposes and find it annoying to have to restart gnome-screenshot for every new screenshot.