use QtQuick.Window 2.2 to be compatible with Qt 5.8

Author: uglide

src/qml/connections-tree/BetterTreeView.qml

@@ -4,7 +4,7 @@ import QtQuick.Controls 1.4
 import QtQuick.Controls.Styles 1.1
 import QtQuick.Dialogs 1.2
 import QtQml.Models 2.2
-import QtQuick.Window 2.3
+import QtQuick.Window 2.2
 import "./../common/platformutils.js" as PlatformUtils
 import "."
 

src/qml/connections-tree/menu/InlineMenu.qml

@@ -1,7 +1,7 @@
 import QtQuick 2.3
 import QtQuick.Layouts 1.1
 import QtQuick.Controls 1.4
-import QtQuick.Window 2.3
+import QtQuick.Window 2.2
 import "./../../common/platformutils.js" as PlatformUtils
 import "./../../"
 

src/qml/connections-tree/menu/database.qml

@@ -1,7 +1,7 @@
 import QtQuick 2.5
 import QtQuick.Layouts 1.1
 import QtQuick.Controls 1.4
-import QtQuick.Window 2.3
+import QtQuick.Window 2.2
 import "./../../common/platformutils.js" as PlatformUtils
 import "."