Allow unbind(focus)

Fix #3279

src/terminal.go

@@ -2719,11 +2719,6 @@ func (t *Terminal) Loop() {
 		}
 	}
 
-	var onFocus []*action
-	if actions, prs := t.keymap[tui.Focus.AsEvent()]; prs {
-		onFocus = actions
-	}
-
 	go func() {
 		var focusedIndex int32 = minItem.Index()
 		var version int64 = -1
@@ -2764,7 +2759,7 @@ func (t *Terminal) Loop() {
 							t.track = trackDisabled
 							t.printInfo()
 						}
-						if onFocus != nil && focusChanged {
+						if onFocus, prs := t.keymap[tui.Focus.AsEvent()]; prs && focusChanged {
 							t.serverChan <- onFocus
 						}
 						if focusChanged || version != t.version {

test/test_go.rb

@@ -2628,12 +2628,16 @@ class TestGoFZF < TestBase
   end
 
   def test_focus_event
-    tmux.send_keys 'seq 100 | fzf --bind "focus:transform-prompt(echo [[{}]])"', :Enter
+    tmux.send_keys 'seq 100 | fzf --bind "focus:transform-prompt(echo [[{}]]),?:unbind(focus)"', :Enter
     tmux.until { |lines| assert_includes(lines[-1], '[[1]]') }
     tmux.send_keys :Up
     tmux.until { |lines| assert_includes(lines[-1], '[[2]]') }
     tmux.send_keys :X
     tmux.until { |lines| assert_includes(lines[-1], '[[]]') }
+    tmux.send_keys '?'
+    tmux.send_keys :BSpace
+    tmux.until { |lines| assert_equal 100, lines.match_count }
+    tmux.until { |lines| refute_includes(lines[-1], '[[1]]') }
   end
 
   def test_labels_center