termui: add show_cursor() and hide_cursor() (#9087)

vlib/term/ui/input_windows.c.v

@@ -68,7 +68,8 @@ pub fn init(cfg Config) &Context {
 	}
 
 	if ctx.cfg.hide_cursor {
-		print('\x1b[?25l')
+		ctx.hide_cursor()
+		ctx.flush()
 	}
 
 	if ctx.cfg.window_title != '' {

vlib/term/ui/termios_nix.c.v

@@ -77,7 +77,8 @@ fn (mut ctx Context) termios_setup() ? {
 	}
 
 	if ctx.cfg.hide_cursor {
-		print('\x1b[?25l')
+		ctx.hide_cursor()
+		ctx.flush()
 	}
 
 	if ctx.cfg.window_title != '' {

vlib/term/ui/ui.v

@@ -58,6 +58,18 @@ pub fn (mut ctx Context) set_cursor_position(x int, y int) {
 	ctx.write('\x1b[$y;${x}H')
 }
 
+[inline]
+// show_cursor will make the cursor appear if it is not already visible
+pub fn (mut ctx Context) show_cursor() {
+	ctx.write('\x1b[?25h')
+}
+
+// hide_cursor will make the cursor invisible
+[inline]
+pub fn (mut ctx Context) hide_cursor() {
+	ctx.write('\x1b[?25l')
+}
+
 [inline]
 // set_color sets the current foreground color used by any succeeding `draw_*` calls.
 pub fn (mut ctx Context) set_color(c Color) {