TouchpadInputMapper: bump generation on display change

Bug: 318695766
Test: atest inputflinger_tests
Test: check Apple Magic Touchpad works as usual on Pixel Tablet before
      and after rotating the screen
Change-Id: I41a992aebf12b321f085954fa0c43dbbfe817a78
diff --git a/services/inputflinger/reader/mapper/TouchpadInputMapper.cpp b/services/inputflinger/reader/mapper/TouchpadInputMapper.cpp
index 255f02d..6f697db 100644
--- a/services/inputflinger/reader/mapper/TouchpadInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/TouchpadInputMapper.cpp
@@ -399,6 +399,8 @@
                     : FloatRect{0, 0, 0, 0};
         }
         mGestureConverter.setBoundsInLogicalDisplay(*boundsInLogicalDisplay);
+
+        bumpGeneration();
     }
     if (!changes.any() || changes.test(InputReaderConfiguration::Change::TOUCHPAD_SETTINGS)) {
         mPropertyProvider.getProperty("Use Custom Touchpad Pointer Accel Curve")