Add unbound "toggle" action for customization

src/options.go

@@ -344,6 +344,8 @@ func parseKeymap(keymap map[int]actionType, toggleSort bool, str string) (map[in
 			keymap[key] = actToggleDown
 		case "toggle-up":
 			keymap[key] = actToggleUp
+		case "toggle":
+			keymap[key] = actToggle
 		case "down":
 			keymap[key] = actDown
 		case "up":

src/terminal.go

@@ -105,6 +105,7 @@ const (
 	actUnixWordRubout
 	actYank
 	actBackwardKillWord
+	actToggle
 	actToggleDown
 	actToggleUp
 	actDown
@@ -724,6 +725,11 @@ func (t *Terminal) Loop() {
 				t.input = append(t.input[:t.cx-1], t.input[t.cx:]...)
 				t.cx--
 			}
+		case actToggle:
+			if t.multi && t.merger.Length() > 0 {
+				toggle()
+				req(reqList)
+			}
 		case actToggleDown:
 			if t.multi && t.merger.Length() > 0 {
 				toggle()