Edit Menu

Undo Reverses (one at a time) a series of editing actions
Redo Reverses (one at a time) a series of Undo actions

Cut Deletes the currrent (merge text) selection and places it on the clipboard
Copy Copies the current selection to the clipboard

Text can be selected by pressing and holding down the mouse button within a difference or merge view window. Then, moving the mouse to highlight the desired text.

Paste Pastes the contents of the clipboard at the insert point (in merge text)

Select All Together View Selects all the contents in the Together View.
Select All 1st View Selects all the contents in the 1st File View.
Select All 2nd View Selects all the contents in the 2nd File View.

See also:

Toolbar