title: Gimp - Easy way to make many layers visible?
body: <p>In Gimp, I've created a .xcf file that consists of some 200 layers. Some are visible and some not. Now I want to create a picture that consists of all layers, so I have to make all layers visible. Later I'll have to return to the state where some layers are visible and some not. How can I achieve this without clicking several hundred clickboxes for visibility?</p>