do not highlight line if there are no items to display

pkg/gui/context/list_context_trait.go

@@ -37,6 +37,8 @@ func formatListFooter(selectedLineIdx int, length int) string {
 func (self *ListContextTrait) HandleFocus(opts ...types.OnFocusOpts) error {
 	self.FocusLine()
 
+	self.viewTrait.SetHighlight(self.list.Len() > 0)
+
 	return self.Context.HandleFocus(opts...)
 }
 

pkg/gui/context/traits/list_cursor.go

@@ -25,7 +25,12 @@ func (self *ListCursor) GetSelectedLineIdx() int {
 }
 
 func (self *ListCursor) SetSelectedLineIdx(value int) {
-	self.selectedIdx = utils.Clamp(value, 0, self.list.Len()-1)
+	clampedValue := -1
+	if self.list.Len() > 0 {
+		clampedValue = utils.Clamp(value, 0, self.list.Len()-1)
+	}
+
+	self.selectedIdx = clampedValue
 }
 
 // moves the cursor up or down by the given amount

pkg/gui/context/view_trait.go

@@ -31,6 +31,10 @@ func (self *ViewTrait) SetContent(content string) {
 	self.view.SetContent(content)
 }
 
+func (self *ViewTrait) SetHighlight(highlight bool) {
+	self.view.Highlight = highlight
+}
+
 func (self *ViewTrait) SetFooter(value string) {
 	self.view.Footer = value
 }