[ui] show window when preferences clicked

docs/circumvention.rst

 Censorship Circumvention
 ================================================================================
 
-This document contains some advice for using BitmaskVPN for censorship
-circumvention.
+This document contains some advice for using BitmaskVPN (or any of its
+derivatives) for censorship circumvention.
 
 Bootstrapping the connection
 -----------------------------

gui/qml/BackgroundImage.qml

@@ -11,7 +11,7 @@ Rectangle {
 
     Image {
         source: parent.backgroundSrc;
-        visible: backgroundVisible;
+        visible: parent.backgroundVisible;
         fillMode: Image.PreserveAspectCrop;
         anchors.fill: parent; 
         opacity: 0.8;

gui/qml/main.qml

@@ -303,7 +303,6 @@ ApplicationWindow {
     }
 
     function setGwSelection() {
-
         if (!isManualLocation()) {
             manualSelectionItem.checked = false
             bar.currentIndex = 1
@@ -312,7 +311,6 @@ ApplicationWindow {
             app.raise()
             return
         }
-
         // last used manual selection
         const location = ctx.currentLocation.toLowerCase()
         const idx = gwSelector.model.indexOf(location)
@@ -320,6 +318,13 @@ ApplicationWindow {
         backend.useLocation(location)
     }
 
+    function showMainWindow() {
+            bar.currentIndex = 0
+            app.visible = true
+            app.show()
+            app.raise()
+    }
+
     Component.onCompleted: {
         Logic.debugInit()
         loginDone = false
@@ -406,6 +411,7 @@ ApplicationWindow {
             MenuItem {
                 text: qsTr("Preferences…")
                 visible: !hasMultipleGateways()
+                onTriggered: showMainWindow()
             }
 
             MenuSeparator {}