[gnome-maps/wip/mlundblad/remove-more-gtk-widget-destroy: 6/6] layersPopover: Stop using gtk_container_get_children()

[Marcus Lundblad <mlundblad src gnome org>]

commit 8b9325f022a5aa383079ee72da110964cb250263
Author: Marcus Lundblad <ml update uu se>
Date:   Sat Apr 24 10:31:57 2021 +0200

    layersPopover: Stop using gtk_container_get_children()
    
    GtkContainer is removed in GTK 4. Prepare by
    using specific API in GtkListBox instead.

 src/layersPopover.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/layersPopover.js b/src/layersPopover.js
index 70f25657..797546fd 100644
--- a/src/layersPopover.js
+++ b/src/layersPopover.js
@@ -252,7 +252,7 @@ var LayersPopover = GObject.registerClass({
 
     _onRemoveClicked(row) {
         this._mapView.removeShapeLayer(row.shapeLayer);
-        if (this._layersListBox.get_children().length <= 0)
+        if (!this._layersListBox.get_row_at_index(0))
             this._layersListBox.hide();
     }