Hide cursor while rendering the screen

Fix #2781
Fix #2588
Fix #1805

Fix https://github.com/junegunn/fzf.vim/issues/1370
Fix https://github.com/junegunn/fzf.vim/issues/1060

CHANGELOG.md

@@ -3,6 +3,7 @@ CHANGELOG
 
 0.30.0
 ------
+- Fixed cursor flickering over the screen by hiding it during rendering
 - Added `--ellipsis` option. You can take advantage of it to make fzf
   effectively search non-visible parts of the item.
   ```sh

src/tui/light.go

@@ -60,7 +60,7 @@ func (r *LightRenderer) csi(code string) {
 
 func (r *LightRenderer) flush() {
 	if r.queued.Len() > 0 {
-		fmt.Fprint(os.Stderr, r.queued.String())
+		fmt.Fprint(os.Stderr, "\x1b[?25l"+r.queued.String()+"\x1b[?25h")
 		r.queued.Reset()
 	}
 }