Hard to believe, but I think fullscreen truly works, even through sleep.

desktop/src-common/advent/screens/dialogue.clj

@@ -11,6 +11,7 @@
             #_[advent.screens.scene :as scene])
   (:import [com.badlogic.gdx.graphics Pixmap Pixmap$Filter Texture Texture$TextureFilter]
            [com.badlogic.gdx.graphics.g2d TextureRegion]
+           [com.badlogic.gdx.utils.viewport FitViewport]
            [com.badlogic.gdx.scenes.scene2d.utils Align]
            [com.badlogic.gdx.math Vector3 Vector2 Matrix4]
            [com.badlogic.gdx Screen]))
@@ -40,7 +41,8 @@
     (utils/setup-viewport screen 1280 960)
     {})
   :on-render
-  (fn [{:keys [camera] :as screen} [entities]]
+  (fn [{:keys [camera ^FitViewport viewport] :as screen} [entities]]
+    (.apply viewport)
     
     (render! screen (vals entities))
     entities)
@@ -124,7 +126,8 @@
                      :x 5 :y 5 :width 1270)}}))
 
   :on-render
-  (fn [screen [entities]]
+  (fn [{:keys [^FitViewport viewport] :as screen} [entities]]
+    (.apply viewport)
     (when (seq (get-in entities [:state :choices]))
       (render! screen [(get-in entities [:state :np])])
       (render! screen (vals entities)))