Partially revert 8037fb76fc to fix mouse polling issues on Windows

app/gui/StreamSegue.qml

@@ -15,6 +15,11 @@ Item {
 
     anchors.fill: parent
 
+    // The StackView will trigger a visibility change when
+    // we're pushed onto it, causing our onVisibleChanged
+    // routine to run, but only if we start as invisible
+    visible: false
+
     function stageStarting(stage)
     {
         // Update the spinner text
@@ -100,7 +105,16 @@ Item {
         id: gamepadKeyNav
     }
 
-    StackView.onActivated: {
+    StackView.onDeactivating: {
+        // Show the toolbar again when popped off the stack
+        toolBar.visible = true
+    }
+
+    // !!! Changing this to use the StackView activation callbacks
+    // causes our mouse polling rate to drop significantly on
+    // Windows for some reason !!!
+    onVisibleChanged: {
+        if (visible) {
             // Hide the toolbar before we start loading
             toolBar.visible = false
 
@@ -124,10 +138,6 @@ Item {
             // Run the streaming session to completion
             session.exec(Screen.virtualX, Screen.virtualY)
         }
-
-    StackView.onDeactivating: {
-        // Show the toolbar again
-        toolBar.visible = true
     }
 
     Row {