ui/termstatus: simplify cleaning up on termination

`writeStatus` also cleans no longer used status lines.
The old code actually cleaned one line too much. However, as that line
was never used it makes no difference.

internal/ui/termstatus/status.go

@@ -105,7 +105,7 @@ func (t *Terminal) run(ctx context.Context) {
 		select {
 		case <-ctx.Done():
 			if !IsProcessBackground(t.fd) {
-				t.undoStatus(len(status))
+				t.writeStatus([]string{})
 			}
 
 			return
@@ -235,30 +235,6 @@ func (t *Terminal) runWithoutStatus(ctx context.Context) {
 	}
 }
 
-func (t *Terminal) undoStatus(lines int) {
-	for i := 0; i < lines; i++ {
-		t.clearCurrentLine(t.wr, t.fd)
-
-		_, err := t.wr.WriteRune('\n')
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "write failed: %v\n", err)
-		}
-
-		// flush is needed so that the current line is updated
-		err = t.wr.Flush()
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "flush failed: %v\n", err)
-		}
-	}
-
-	t.moveCursorUp(t.wr, t.fd, lines)
-
-	err := t.wr.Flush()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "flush failed: %v\n", err)
-	}
-}
-
 func (t *Terminal) print(line string, isErr bool) {
 	// make sure the line ends with a line break
 	if line[len(line)-1] != '\n' {

internal/ui/termstatus/status_test.go

@@ -39,11 +39,10 @@ func TestSetStatus(t *testing.T) {
 	term.SetStatus([]string{"quux", "needs\nquote"})
 	exp += home + clear + "quux\n" +
 		home + clear + "\"needs\\nquote\"\n" +
-		home + clear + home + up + up // Third line implicit.
+		home + clear + home + up + up // Clear third line
 
 	cancel()
-	exp += home + clear + "\n" + home + clear + "\n" +
-		home + up + up // Status cleared.
+	exp += home + clear + "\n" + home + clear + home + up // Status cleared
 
 	<-term.closed
 	rtest.Equals(t, exp, buf.String())