It makes sense to actually also build the new input_event_spy.cpp

Sometimes C++ surprises me. How could that compile without being in
the build set?

CMakeLists.txt

@@ -368,6 +368,7 @@ set(kwin_KDEINIT_SRCS
    globalshortcuts.cpp
    input.cpp
    input_event.cpp
+   input_event_spy.cpp
    keyboard_input.cpp
    pointer_input.cpp
    touch_input.cpp

input_event_spy.cpp

@@ -20,6 +20,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "input_event_spy.h"
 #include "input.h"
 
+#include <QPointF>
+#include <QSizeF>
+
 namespace KWin
 {
 

input_event_spy.h

@@ -23,6 +23,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <QtGlobal>
 
+class QPointF;
+class QSizeF;
+
 namespace KWin
 {
 class KeyEvent;