Force setting fields to update when discarding changes

Textfields that have the focus don't (always) update when a new value is set.
CURA-1585

resources/qml/Settings/SettingItem.qml

@@ -7,6 +7,7 @@ import QtQuick.Controls 1.1
 import QtQuick.Controls.Styles 1.1
 
 import UM 1.1 as UM
+import Cura 1.0 as Cura
 
 import "."
 
@@ -245,5 +246,14 @@ Item {
         }
     }
 
+    Connections
+    {
+        target: Cura.MachineManager
+        onBlurSettings:
+        {
+            revertButton.focus = true
+        }
+    }
+
     UM.I18nCatalog { id: catalog; name: "cura" }
 }