Set geometry hints for max width and height

src/lightdm-webkit2-greeter.c

@@ -69,8 +69,7 @@ sigterm_cb (int signum)
 }
 
 int
-main (int argc, char **argv)
-{
+main(int argc, char **argv) {
     GdkScreen *screen;
     GdkRectangle geometry;
     GKeyFile *keyfile;
@@ -91,10 +90,23 @@ main (int argc, char **argv)
 
     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     screen = gtk_window_get_screen(GTK_WINDOW(window));
+
+    gtk_window_set_decorated(GTK_WINDOW(window), FALSE);
     gdk_screen_get_monitor_geometry(screen, gdk_screen_get_primary_monitor(screen), &geometry);
+
+    GdkGeometry hints;
+    hints.min_width = geometry.width;
+    hints.max_width = geometry.width;
+    hints.min_height = geometry.height;
+    hints.max_height = geometry.height;
+
+    gtk_window_set_geometry_hints(GTK_WINDOW(window), window, &hints,
+                                  (GdkWindowHints)(GDK_HINT_MIN_SIZE | GDK_HINT_MAX_SIZE));
+
     gtk_window_set_default_size(GTK_WINDOW(window), geometry.width, geometry.height);
     gtk_window_move(GTK_WINDOW(window), geometry.x, geometry.y);
-    gdk_window_set_cursor (gdk_get_default_root_window (), gdk_cursor_new_for_display (gtk_widget_get_display (window), GDK_LEFT_PTR));
+    gdk_window_set_cursor(gdk_get_default_root_window(),
+                          gdk_cursor_new_for_display(gtk_widget_get_display(window), GDK_LEFT_PTR));
 
     web_view = webkit_web_view_new();