Undo - Reverses the last edit to the active image. It can remove painting or drawing commands, color alterations, filter effects, etc.
Copy All - Copies whole image to the clipboard.
Copy Selection - Copies current selection to the clipboard.
Paste As new image - Make clipboard image as current image.
Paste As new selection - Pastes clipboard image in current selection, stretching the image to fit the selection.
Select - Select a part of the image. The selected area will be outlined with a white-black animated rectangle. Selected region is sizeable and moveable.
Select All - Selects the whole image.
Deselect - Set as selected no image.