[display] Hide the cursor in interactive mode.

Hiding the cursor should eliminate the last of the redraw artifacts.

pkg/backend/display/internal/terminal/info.go

@@ -14,6 +14,8 @@ type Info interface {
 	ClearLine(out io.Writer)
 	CursorUp(out io.Writer, count int)
 	CursorDown(out io.Writer, count int)
+	HideCursor(out io.Writer)
+	ShowCursor(out io.Writer)
 }
 
 /* Satisfied by gotty.TermInfo as well as noTermInfo from below */
@@ -87,3 +89,15 @@ func (i info) CursorDown(out io.Writer, count int) {
 		fmt.Fprintf(out, "\x1b[%dB", count)
 	}
 }
+
+func (i info) HideCursor(out io.Writer) {
+	if attr, err := i.Parse("civis"); err == nil {
+		fmt.Fprintf(out, "%s", attr)
+	}
+}
+
+func (i info) ShowCursor(out io.Writer) {
+	if attr, err := i.Parse("cnorm"); err == nil {
+		fmt.Fprintf(out, "%s", attr)
+	}
+}

pkg/backend/display/internal/terminal/mock.go

@@ -64,6 +64,14 @@ func (t *MockTerminal) CursorDown(count int) {
 	t.info.CursorDown(t, count)
 }
 
+func (t *MockTerminal) HideCursor() {
+	t.info.HideCursor(t)
+}
+
+func (t *MockTerminal) ShowCursor() {
+	t.info.ShowCursor(t)
+}
+
 func (t *MockTerminal) ReadKey() (string, error) {
 	k, ok := <-t.keys
 	if !ok {

pkg/backend/display/internal/terminal/term.go

@@ -21,6 +21,8 @@ type Terminal interface {
 	ClearEnd()
 	CursorUp(count int)
 	CursorDown(count int)
+	HideCursor()
+	ShowCursor()
 
 	ReadKey() (string, error)
 }
@@ -144,6 +146,14 @@ func (t *terminal) CursorDown(count int) {
 	t.info.CursorDown(t.out, count)
 }
 
+func (t *terminal) HideCursor() {
+	t.info.HideCursor(t.out)
+}
+
+func (t *terminal) ShowCursor() {
+	t.info.ShowCursor(t.out)
+}
+
 func (t *terminal) ReadKey() (string, error) {
 	if t.in == nil {
 		return "", io.EOF

pkg/backend/display/tree.go

@@ -58,6 +58,7 @@ func newInteractiveRenderer(term terminal.Terminal, opts Options) progressRender
 	if !term.IsRaw() {
 		return newInteractiveMessageRenderer(term, opts)
 	}
+	term.HideCursor()
 
 	r := &treeRenderer{
 		opts:   opts,
@@ -75,6 +76,7 @@ func newInteractiveRenderer(term terminal.Terminal, opts Options) progressRender
 }
 
 func (r *treeRenderer) Close() error {
+	r.term.ShowCursor()
 	return r.term.Close()
 }