[PATCH v2] ui/gtk: fix cursor moved to left corner

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Do not attempt to move the pointer if the widget is not yet realized.
The mouse cursor is placed to the corner of the screen, on X11 at least,
as x_root and y_root are then miscalculated. (this is not reproducible
on Wayland, because Gtk doesn't implement device warping there)

This also fixes the following warning at start:
qemu: Gdk: gdk_window_get_root_coords: assertion 'GDK_IS_WINDOW (window)' failed

Fixes: 6effaa16ac98 ("ui: set cursor position upon listener
registration")
Reported-by: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 ui/gtk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ui/gtk.c b/ui/gtk.c
index fd82e9b1ca..e9564f2baa 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -450,7 +450,8 @@ static void gd_mouse_set(DisplayChangeListener *dcl,
     GdkDisplay *dpy;
     gint x_root, y_root;
 
-    if (qemu_input_is_absolute()) {
+    if (!gtk_widget_get_realized(vc->gfx.drawing_area) ||
+        qemu_input_is_absolute()) {
         return;
     }
 
-- 
2.39.2