The Menu

Menu - Edit - Source

Undo

Undo the latest change that you have done at the text field.

Redo

Redo the latest change that you have done at the text field.

Cut

Cuts the selected text. If nothing has been selected, this action clears the text field completely.

Copy

Copies the selected txt to the clip board.

Paste

Pastes the content from the clip board to the text editor, if the content is text.

Find Unit

Opens the Find dialog in order to search for units in source.

Select Default Unit

Sets the default unit.

+1

Increments the value by one.

-1

Decrements the value by one.

Set Value to Default

Sets the value to the default value.