[gnome-panel] addto-dialog: avoid deprecated gdk_screen_get_height

[Alberts Muktupāvels <muktupavels src gnome org>]

commit fd9517e6110a03e68793a99831a1b4f1bd9922f1
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Mar 7 22:43:15 2020 +0200

    addto-dialog: avoid deprecated gdk_screen_get_height
    
    Use monitor workarea to calculate dialog height.

 gnome-panel/panel-addto-dialog.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/gnome-panel/panel-addto-dialog.c b/gnome-panel/panel-addto-dialog.c
index 7cf1c7ffc..1193be920 100644
--- a/gnome-panel/panel-addto-dialog.c
+++ b/gnome-panel/panel-addto-dialog.c
@@ -1241,7 +1241,10 @@ panel_addto_present (GtkMenuItem *item,
        PanelObjectPackType insert_pack_type;
        GdkEvent *current_event;
        GdkScreen *screen;
-       gint screen_height;
+       GdkDisplay *display;
+       GdkWindow *window;
+       GdkMonitor *monitor;
+       GdkRectangle workarea;
        gint height;
 
        toplevel = panel_widget->toplevel;
@@ -1254,8 +1257,11 @@ panel_addto_present (GtkMenuItem *item,
                                     panel_addto_dialog_quark);
 
        screen = gtk_window_get_screen (GTK_WINDOW (toplevel));
-       screen_height = gdk_screen_get_height (screen);
-       height = MIN (MAX_ADDTOPANEL_HEIGHT, 3 * (screen_height / 4));
+       display = gdk_screen_get_display (screen);
+       window = gtk_widget_get_window (GTK_WIDGET (panel_widget));
+       monitor = gdk_display_get_monitor_at_window (display, window);
+       gdk_monitor_get_workarea (monitor, &workarea);
+       height = MIN (MAX_ADDTOPANEL_HEIGHT, 3 * (workarea.height / 4));
 
        if (!dialog) {
                dialog = panel_addto_dialog_new (panel_widget);