Preserve replacement session Deck input routing

app/src/main/java/com/droiddeck/launcher/SessionActivity.kt

@@ -5115,7 +5115,7 @@ class SessionActivity : ComponentActivity(), SurfaceHolder.Callback {
         padBridge?.setInputEnabled(false)
         physicalInputBindings?.close()
         padBridge?.stop()
-        DeckControls.setRouter(null)
+        DeckControls.clearRouter(inputRouter)
         inputRouter = null
         heldKeys.clear()
         heldButtons.clear()

app/src/main/java/com/droiddeck/launcher/input/DeckControls.kt

@@ -23,6 +23,11 @@ object DeckControls {
         publish()
     }
 
+    @Synchronized
+    fun clearRouter(owner: InputRouter?) {
+        if (owner != null && router === owner) setRouter(null)
+    }
+
     @Synchronized
     @JvmOverloads
     fun source(role: InputRole, routed: Boolean = false) = Source(role, routed)

app/src/test/java/com/droiddeck/launcher/input/InputSourceOwnershipTest.kt

@@ -136,6 +136,41 @@ class InputSourceOwnershipTest {
         } finally { surface.close() }
     }
 
+    @Test fun clearingOldDeckOwnerPreservesReplacementBindingsAndHeldKeys() {
+        val previous = InputRouter(RecordingOutput())
+        val output = RecordingOutput()
+        val replacement = InputRouter(output).also {
+            it.setProfile(InputProfile.defaults(InputProfile.GAME)
+                .withBinding(InputRole.PHYSICAL, InputControl.L4, InputAction.Keys(listOf(57))))
+        }
+        DeckControls.setRouter(previous)
+        DeckControls.setRouter(replacement)
+        DeckControls.setGrip(DeckControls.L4, true)
+        DeckControls.clearRouter(previous)
+        DeckControls.clearRouter(null)
+        assertEquals(listOf("key 57 true"), output.events)
+        DeckControls.setGrip(DeckControls.L4, false)
+        DeckControls.setGrip(DeckControls.L4, true)
+        assertEquals(listOf("key 57 true", "key 57 false", "key 57 true"), output.events)
+        assertEquals(0, JoyConPadTest.RecordingWriter.grips)
+    }
+
+    @Test fun clearingCurrentDeckOwnerReleasesItsKeysAndRemovesBindings() {
+        val output = RecordingOutput()
+        val router = InputRouter(output).also {
+            it.setProfile(InputProfile.defaults(InputProfile.GAME)
+                .withBinding(InputRole.PHYSICAL, InputControl.L4, InputAction.Keys(listOf(57))))
+        }
+        DeckControls.setRouter(router)
+        DeckControls.setGrip(DeckControls.L4, true)
+        DeckControls.clearRouter(router)
+        DeckControls.clearRouter(router)
+        DeckControls.setGrip(DeckControls.L4, false)
+        DeckControls.setGrip(DeckControls.L4, true)
+        assertEquals(listOf("key 57 true", "key 57 false"), output.events)
+        assertEquals(DeckControls.L4, JoyConPadTest.RecordingWriter.grips)
+    }
+
     @Test fun releasingAllKeepsPhysicalGripsBlockedUntilNeutral() {
         val router = InputRouter(RecordingOutput())
         bridge.setInputRouter(router)

docs/development/unified-input-validation.md

@@ -42,6 +42,13 @@ Actual display captures and test reports are retained locally under
 `app/build/reports/input-publish/`. Screenshot publication is subject to the
 user's review. No new latency measurement was made for this UI revision.
 
+The follow-up router-ownership fix passed **47 tests** in `InputSourceOwnershipTest`,
+`InputSurfaceSourceTest`, and `InputRouterTest`, including two new regressions.
+An obsolete activity (or one without a router) cannot detach the replacement
+activity's Deck routes; the current owner still releases its held keys on cleanup.
+This follow-up changes teardown only and was not reinstalled or retested on Thor,
+which was no longer available over ADB after the screenshot pass.
+
 ## Input settings polish, 2026-11-06
 
 The final input/UI host run passed **941 tests in 124 suites, zero failures**.