Add 'focus' event

Can we find a better name? I have considered the followings.

* 'point', because "the pointer" points to the current item.
* 'shift', 'switch', 'move', etc. These are not technically correct
  because the current item can change without cursor movement (--tac,
  reload, search update)
* 'change' is already taken. 'change-current' feels a bit wordy and
  sounds wrong, 'current-changed' is wordy and doesn't go well with the
  other event names
* 'target', not straightforward

Close #3053

1 files changed, 9 insertions, 0 deletions

diff --git a/test/test_go.rb b/test/test_go.rb
index 5bf5ab58..67207fb4 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -2473,6 +2473,15 @@ class TestGoFZF < TestBase
     end
   end
 
+  def test_focus_event
+    tmux.send_keys 'seq 100 | fzf --bind "focus:transform-prompt(echo [[{}]])"', :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], '[[]]') }
+  end
+
   def test_labels_center
     tmux.send_keys 'echo x | fzf --border --border-label foobar --preview : --preview-label barfoo --bind "space:change-border-label(foobarfoo)+change-preview-label(barfoobar),enter:transform-border-label(echo foo{}foo)+transform-preview-label(echo bar{}bar)"', :Enter
     tmux.until do