backends/libinput: Ignore redundant events for pointer buttons and keyboard keys when pressed/released on multiple devices

BUG: 486034

src/backends/libinput/connection.cpp

@@ -302,6 +302,12 @@ void Connection::processEvents()
         }
         case LIBINPUT_EVENT_KEYBOARD_KEY: {
             KeyEvent *ke = static_cast<KeyEvent *>(event.get());
+            const int seatKeyCount = libinput_event_keyboard_get_seat_key_count(*ke);
+            const int keyState = libinput_event_keyboard_get_key_state(*ke);
+            if ((keyState == LIBINPUT_KEY_STATE_PRESSED && seatKeyCount != 1) ||
+                (keyState == LIBINPUT_KEY_STATE_RELEASED && seatKeyCount != 0)) {
+                break;
+            }
             Q_EMIT ke->device()->keyChanged(ke->key(), ke->state(), ke->time(), ke->device());
             break;
         }
@@ -349,6 +355,12 @@ void Connection::processEvents()
         }
         case LIBINPUT_EVENT_POINTER_BUTTON: {
             PointerEvent *pe = static_cast<PointerEvent *>(event.get());
+            const int seatButtonCount = libinput_event_pointer_get_seat_button_count(*pe);
+            const int buttonState = libinput_event_pointer_get_button_state(*pe);
+            if ((buttonState == LIBINPUT_BUTTON_STATE_PRESSED && seatButtonCount != 1) ||
+                (buttonState == LIBINPUT_BUTTON_STATE_RELEASED && seatButtonCount != 0)) {
+                break;
+            }
             Q_EMIT pe->device()->pointerButtonChanged(pe->button(), pe->buttonState(), pe->time(), pe->device());
             Q_EMIT pe->device()->pointerFrame(pe->device());
             break;