src/vs/workbench/contrib/scm/browser/dirtydiffDecorator.ts/ShowPreviousChangeAction/constructor
class ShowPreviousChangeAction:	constructor() {
		super({
			id: 'editor.action.dirtydiff.previous',
			label: nls.localize('show previous change', "Show Previous Change"),
			alias: 'Show Previous Change',
			precondition: TextCompareEditorActiveContext.toNegated(),
			kbOpts: { kbExpr: EditorContextKeys.editorTextFocus, primary: KeyMod.Shift | KeyMod.Alt | KeyCode.F3, weight: KeybindingWeight.EditorContrib }
		});
	}