StudioWelcome: Scale down splash screen if it does not fit

If the splash screen does not fit on the screen we have to scale it down.

Task-number: QDS-7449
Change-Id: I73018563e9f863d3a8f60facf7599590fb602f0f
Reviewed-by: Brook Cronin <brook.cronin@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/plugins/studiowelcome/qml/splashscreen/Welcome_splash.qml

@@ -32,7 +32,8 @@ import QtQuick.Shapes 1.0
 
 Rectangle {
     id: welcome_splash
-    anchors.fill: parent
+    width: 600
+    height: 720
     clip: true
 
     gradient: Gradient {
@@ -55,8 +56,6 @@ Rectangle {
     property bool doNotShowAgain: true
     property bool loadingPlugins: true
 
-    width: 600
-    height: 720
     visible: true
     color: "#1d212a"
 

src/plugins/studiowelcome/qml/splashscreen/main.qml

@@ -27,8 +27,13 @@ import QtQuick 2.0
 
 Item {
     id: root
-    width: 600
-    height: 720
+    width: 600 * root.mainScale
+    height: 720 * root.mainScale
+
+    property int maxHeight: Screen.desktopAvailableHeight - 100
+
+    property real mainScale: root.maxHeight > 720 ? 1 : root.maxHeight / 720
+
 
     signal closeClicked
     signal checkBoxToggled
@@ -42,9 +47,10 @@ Item {
     }
 
     Welcome_splash {
+        scale: root.mainScale
         id: welcome_splash
-        x: 0
-        y: 0
+
+        transformOrigin: Item.TopLeft
         antialiasing: true
         onCloseClicked: root.closeClicked()
         onConfigureClicked: root.configureClicked()