Fix 'jump' when pointer is empty

Fix #4270

src/terminal.go

@@ -2755,11 +2755,15 @@ func (t *Terminal) printItem(result Result, line int, maxLine int, index int, cu
 	item := result.item
 	_, selected := t.selected[item.Index()]
 	label := ""
+	extraWidth := 0
 	if t.jumping != jumpDisabled {
 		if index < len(t.jumpLabels) {
 			// Striped
 			current = index%2 == 0
-			label = t.jumpLabels[index:index+1] + strings.Repeat(" ", t.pointerLen-1)
+			label = t.jumpLabels[index:index+1] + strings.Repeat(" ", util.Max(0, t.pointerLen-1))
+			if t.pointerLen == 0 {
+				extraWidth = 1
+			}
 		}
 	} else if current {
 		label = t.pointer
@@ -2788,6 +2792,7 @@ func (t *Terminal) printItem(result Result, line int, maxLine int, index int, cu
 
 	maxWidth := t.window.Width() - (t.pointerLen + t.markerLen + 1)
 	postTask := func(lineNum int, width int, wrapped bool, forceRedraw bool) {
+		width += extraWidth
 		if (current || selected) && t.highlightLine {
 			color := tui.ColSelected
 			if current {

test/test_core.rb

@@ -827,6 +827,24 @@ class TestCore < TestInteractive
     tmux.until { |lines| assert(lines.any? { it.include?('jump cancelled at 3') }) }
   end
 
+  def test_jump_no_pointer
+    tmux.send_keys "seq 100 | #{FZF} --pointer= --jump-labels 12345 --bind ctrl-j:jump", :Enter
+    tmux.until { |lines| assert_equal 100, lines.match_count }
+    tmux.send_keys 'C-j'
+    tmux.until { |lines| assert_equal '5 5', lines[-7] }
+    tmux.send_keys 'C-c'
+    tmux.until { |lines| assert_equal ' 5', lines[-7] }
+  end
+
+  def test_jump_no_pointer_no_marker
+    tmux.send_keys "seq 100 | #{FZF} --pointer= --marker= --jump-labels 12345 --bind ctrl-j:jump", :Enter
+    tmux.until { |lines| assert_equal 100, lines.match_count }
+    tmux.send_keys 'C-j'
+    tmux.until { |lines| assert_equal '55', lines[-7] }
+    tmux.send_keys 'C-c'
+    tmux.until { |lines| assert_equal '5', lines[-7] }
+  end
+
   def test_pointer
     tmux.send_keys "seq 10 | #{fzf("--pointer '>>'")}", :Enter
     # Assert that specified pointer is displayed