[CD Cursor] Fix invalid displayId set when topology is not yet set

The issue here was that both currentCursor and topology
has invalid displayId, but input devices have been set.. Which caused
[Cursor|Touchpad]InputMapper to not get notified on DISPLAY_INFO
reconfiguration, and rejecting all motion events.

Bug: 399893492
Bug: 396568321
Test: Manually verified with attached cursor on reboot
Flag: com.android.input.flags.connected_displays_associated_display_cursor_bugfix
Change-Id: I016c646acdf6bd7b0fdb2840c852b825ccad9e1b

Author: nergi

services/inputflinger/PointerChoreographer.cpp

@@ -677,7 +677,13 @@ ui::LogicalDisplayId PointerChoreographer::getTargetMouseDisplayLocked(
         mTopology.graph.find(associatedDisplayId) == mTopology.graph.end()) {
         return associatedDisplayId;
     }
-    return mCurrentMouseDisplayId.isValid() ? mCurrentMouseDisplayId : mTopology.primaryDisplayId;
+    if (mCurrentMouseDisplayId.isValid()) {
+        return mCurrentMouseDisplayId;
+    }
+    if (mTopology.primaryDisplayId.isValid()) {
+        return mTopology.primaryDisplayId;
+    }
+    return ui::LogicalDisplayId::DEFAULT;
 }
 
 std::pair<ui::LogicalDisplayId, PointerControllerInterface&>
@@ -786,7 +792,8 @@ PointerChoreographer::PointerDisplayChange
 PointerChoreographer::calculatePointerDisplayChangeToNotify() {
     ui::LogicalDisplayId displayIdToNotify = ui::LogicalDisplayId::INVALID;
     vec2 cursorPosition = {0, 0};
-    if (const auto it = mMousePointersByDisplay.find(mCurrentMouseDisplayId);
+    if (const auto it =
+                mMousePointersByDisplay.find(getTargetMouseDisplayLocked(mCurrentMouseDisplayId));
         it != mMousePointersByDisplay.end()) {
         const auto& pointerController = it->second;
         // Use the displayId from the pointerController, because it accurately reflects whether

services/inputflinger/tests/PointerChoreographer_test.cpp

@@ -361,6 +361,17 @@ TEST_F(PointerChoreographerTest, CallsNotifyPointerDisplayIdChanged) {
     assertPointerDisplayIdNotified(DISPLAY_ID);
 }
 
+TEST_F(PointerChoreographerTest, NoDefaultMouseSetFallbackToDefaultDisplayId) {
+    mChoreographer.setDisplayViewports(createViewports({ui::LogicalDisplayId::DEFAULT}));
+    mChoreographer.notifyInputDevicesChanged(
+            {/*id=*/0,
+             {generateTestDeviceInfo(DEVICE_ID, AINPUT_SOURCE_MOUSE,
+                                     ui::LogicalDisplayId::INVALID)}});
+    assertPointerControllerCreated(ControllerType::MOUSE);
+
+    assertPointerDisplayIdNotified(ui::LogicalDisplayId::DEFAULT);
+}
+
 TEST_F(PointerChoreographerTest, WhenViewportIsSetLaterCallsNotifyPointerDisplayIdChanged) {
     setDefaultMouseDisplayId(DISPLAY_ID);
     mChoreographer.notifyInputDevicesChanged(