Deprecated QtQuickControls 1 has some problems on Mac OSX.

In this particular case it was easiest to do the in a sense proper thing and just upgrade.

CURA-8127

resources/qml/Preferences/GeneralPage.qml

@@ -1,13 +1,13 @@
 // Copyright (c) 2020 Ultimaker B.V.
 // Cura is released under the terms of the LGPLv3 or higher.
 
-import QtQuick 2.1
+import QtQuick 2.10
-import QtQuick.Controls 1.1
+import QtQuick.Controls 2.3
 import QtQuick.Layouts 1.1
 import QtQuick.Controls.Styles 1.1
 
 import UM 1.1 as UM
-import Cura 1.0 as Cura
+import Cura 1.1 as Cura
 
 UM.PreferencesPage
 {
@@ -123,8 +123,6 @@ UM.PreferencesPage
         width: parent.width
         height: parent.height
 
-        flickableItem.flickableDirection: Flickable.VerticalFlick;
-
         Column
         {
 
@@ -148,16 +146,14 @@ UM.PreferencesPage
                     text: "Language:" //Don't translate this, to make it easier to find the language drop-down if you can't read the current language.
                 }
 
-                ComboBox
+                ListModel
-                {
-                    id: languageComboBox
-                    model: ListModel
                 {
                     id: languageList
 
-                        Component.onCompleted: {
+                    Component.onCompleted:
+                    {
                         append({ text: "English", code: "en_US" })
-                            append({ text: "Čeština", code: "cs_CZ" })
+                        //Czech is disabled for being incomplete: append({ text: "Čeština", code: "cs_CZ" })
                         append({ text: "Deutsch", code: "de_DE" })
                         append({ text: "Español", code: "es_ES" })
                         //Finnish is disabled for being incomplete: append({ text: "Suomi", code: "fi_FI" })
@@ -182,6 +178,13 @@ UM.PreferencesPage
                     }
                 }
 
+                ComboBox
+                {
+                    id: languageComboBox
+
+                    textRole: "text"
+                    model: languageList
+
                     currentIndex:
                     {
                         var code = UM.Preferences.getValue("general/language");
@@ -229,11 +232,7 @@ UM.PreferencesPage
                     text: catalog.i18nc("@label","Theme:")
                 }
 
-                ComboBox
+                ListModel
-                {
-                    id: themeComboBox
-
-                    model: ListModel
                 {
                     id: themeList
 
@@ -246,6 +245,13 @@ UM.PreferencesPage
                     }
                 }
 
+                ComboBox
+                {
+                    id: themeComboBox
+
+                    model: themeList
+                    textRole: "text"
+
                     currentIndex:
                     {
                         var code = UM.Preferences.getValue("general/theme");
@@ -519,20 +525,23 @@ UM.PreferencesPage
                     {
                         text: catalog.i18nc("@window:text", "Camera rendering:")
                     }
-                    ComboBox
+                    ListModel
-                    {
-                        id: cameraComboBox
-
-                        model: ListModel
                     {
                         id: comboBoxList
-
+                        Component.onCompleted:
-                            Component.onCompleted: {
+                        {
                             append({ text: catalog.i18n("Perspective"), code: "perspective" })
                             append({ text: catalog.i18n("Orthographic"), code: "orthographic" })
                         }
                     }
 
+                    ComboBox
+                    {
+                        id: cameraComboBox
+
+                        model: comboBoxList
+                        textRole: "text"
+
                         currentIndex:
                         {
                             var code = UM.Preferences.getValue("general/camera_perspective_mode");
@@ -683,6 +692,7 @@ UM.PreferencesPage
                                 append({ text: catalog.i18nc("@option:openProject", "Always import models"), code: "open_as_model" })
                             }
                         }
+                        textRole: "text"
 
                         currentIndex:
                         {
@@ -749,6 +759,7 @@ UM.PreferencesPage
                                 append({ text: catalog.i18nc("@option:discardOrKeep", "Always transfer changed settings to new profile"), code: "always_keep" })
                             }
                         }
+                        textRole: "text"
 
                         currentIndex:
                         {