[gnome-maps] Layers: deactivate ListBoxRow if layer is hidden

[Hashem Nasarat <hnasarat src gnome org>]

commit e8daecd104d44d31c2e0986563d2588a885839af
Author: Hashem Nasarat <hashem riseup net>
Date:   Thu Feb 11 17:57:50 2016 -0500

    Layers: deactivate ListBoxRow if layer is hidden
    
    This way you can't click on the row and center a shape layer that isn't
    visible!
    
    https://bugzilla.gnome.org/show_bug.cgi?id=761884

 src/layersPopover.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/layersPopover.js b/src/layersPopover.js
index a4f2c74..6535587 100644
--- a/src/layersPopover.js
+++ b/src/layersPopover.js
@@ -42,6 +42,7 @@ const ShapeLayerRow = new Lang.Class({
             let image = this._visibleButton.get_child();
 
             this.shapeLayer.visible = !this.shapeLayer.visible;
+            this.activatable = this.shapeLayer.visible;
             if (this.shapeLayer.visible)
                 image.icon_name = 'layer-visible-symbolic';
             else