ui/vc: move text console invalidate in helper

This will allow to split the VC code in a separate unit more easily.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230830093843.3531473-43-marcandre.lureau@redhat.com>

include/ui/console.h

@@ -521,6 +521,7 @@ void console_select(unsigned int index);
 void qemu_console_resize(QemuConsole *con, int width, int height);
 DisplaySurface *qemu_console_surface(QemuConsole *con);
 void coroutine_fn qemu_console_co_wait_update(QemuConsole *con);
+int qemu_invalidate_text_consoles(void);
 
 /* console-gl.c */
 #ifdef CONFIG_OPENGL

ui/console.c

@@ -2500,13 +2500,11 @@ static void vc_chr_set_echo(Chardev *chr, bool echo)
     drv->console->echo = echo;
 }
 
-static void text_console_update_cursor(void *opaque)
+int qemu_invalidate_text_consoles(void)
 {
     QemuConsole *s;
     int count = 0;
 
-    cursor_visible_phase = !cursor_visible_phase;
-
     QTAILQ_FOREACH(s, &consoles, next) {
         if (qemu_console_is_graphic(s) ||
             !qemu_console_is_visible(s)) {
@@ -2516,7 +2514,14 @@ static void text_console_update_cursor(void *opaque)
         graphic_hw_invalidate(s);
     }
 
-    if (count) {
+    return count;
+}
+
+static void text_console_update_cursor(void *opaque)
+{
+    cursor_visible_phase = !cursor_visible_phase;
+
+    if (qemu_invalidate_text_consoles()) {
         timer_mod(cursor_timer,
                   qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + CONSOLE_CURSOR_PERIOD / 2);
     }