consume a finished queued track without reloading the window

Advancing naturally out of an up-next track rebuilt the whole window,
which reset the already-playing next track back to its start — audible
as the first second repeating. Remove the finished item from the player
in place (as the context edit path already does) and recentre instead,
so the current item and its prepared source survive. Regression test
asserts no setWindow on a natural advance out of a queued track.

app/src/main/kotlin/com/subtracks/playback/PlaybackController.kt

@@ -554,7 +554,17 @@ class PlaybackController(
             endedHandled = false
             val next = if (position < updated.size) position else 0L
             queueRepository.setCursor(next)
-            loadWindow(next, autoplay = true)
+            val player = player
+            if (next == position && player != null && position - windowStart in 0 until player.itemCount) {
+                updating = true
+                player.removeAt((position - windowStart).toInt())
+                updating = false
+                windowEnd--
+                shiftWindowLocked(next)
+                refresh(next)
+            } else {
+                loadWindow(next, autoplay = true)
+            }
         }
 
     fun previous() {

app/src/test/kotlin/com/subtracks/playback/PlaybackControllerTest.kt

@@ -823,6 +823,34 @@ class PlaybackControllerTest {
         eager.close()
     }
 
+    @Test
+    fun naturallyAdvancingOutOfAQueuedTrackDoesNotReloadTheWindow() {
+        seedAlbum(3, sourceId = 1)
+        seedSong("x1", "al2")
+
+        controller.playAlbum(1, "al1", 0)
+        await {
+            controller.state.value.item
+                ?.id == "s1"
+        }
+        controller.addToQueue(1, QueueKind.Song, "x1")
+        await { runBlocking { controller.upcomingItem()?.id } == "x1" }
+        controller.next()
+        await {
+            controller.state.value.item
+                ?.id == "x1"
+        }
+
+        handle.operations.clear()
+        handle.advanceTo(handle.currentIndex + 1)
+        await {
+            controller.state.value.item
+                ?.id == "s2"
+        }
+
+        assertFalse(handle.operations.any { it.startsWith("setWindow") })
+    }
+
     @Test
     fun nextFollowsTheReorderedQueue() {
         seedAlbum(3, sourceId = 1)