Add 'multi' event triggered on multi-selection changes

src/options.go

@@ -1008,6 +1008,8 @@ func parseKeyChordsImpl(str string, message string) (map[tui.Event]string, error
 			add(tui.JumpCancel)
 		case "click-header":
 			add(tui.ClickHeader)
+		case "multi":
+			add(tui.Multi)
 		case "alt-enter", "alt-return":
 			chords[tui.CtrlAltKey('m')] = key
 		case "alt-space":
@@ -1561,7 +1563,7 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actCancel)
 		case "clear-query":
 			appendAction(actClearQuery)
-		case "clear-selection":
+		case "clear-multi", "clear-selection":
 			appendAction(actClearSelection)
 		case "forward-char":
 			appendAction(actForwardChar)

src/terminal.go

@@ -5399,6 +5399,7 @@ func (t *Terminal) Loop() error {
 		}
 		previousInput := t.input
 		previousCx := t.cx
+		previousVersion := t.version
 		t.lastKey = event.KeyName()
 		updatePreviewWindow := func(forcePreview bool) {
 			t.resizeWindows(forcePreview, false)
@@ -6656,6 +6657,9 @@ func (t *Terminal) Loop() error {
 			if onEOFs, prs := t.keymap[tui.BackwardEOF.AsEvent()]; beof && prs && !doActions(onEOFs) {
 				continue
 			}
+			if onMultis, prs := t.keymap[tui.Multi.AsEvent()]; t.version != previousVersion && prs && !doActions(onMultis) {
+				continue
+			}
 		} else {
 			jumpEvent := tui.JumpCancel
 			if event.Type == tui.Rune {

src/tui/tui.go

@@ -132,6 +132,7 @@ const (
 	Jump
 	JumpCancel
 	ClickHeader
+	Multi
 )
 
 func (t EventType) AsEvent() Event {