Created attachment 283527 [details] [review]
Fix gimp_test_utils_synthesize_key_event()

2 tests were failing for win32: crop_tool_can_crop() in app/tests/test-tools.c and keyboard_zoom_focus() in app/tests/test-ui.c. gimp_test_utils_synthesize_key_event() was at fault, in particular because here is gdk_test_simulate_key() implementation for win32:

gboolean
gdk_test_simulate_key (GdkWindow      *window,
                       gint            x,
                       gint            y,
                       guint           keyval,
                       GdkModifierType modifiers,
                       GdkEventType    key_pressrelease)
{
  g_return_val_if_fail (key_pressrelease == GDK_KEY_PRESS || key_pressrelease == GDK_KEY_RELEASE, FALSE);
  g_return_val_if_fail (window != NULL, FALSE);
  return FALSE;
}

Basically it does nothing.
I wrote down an alternative win32 implementation, I'll also send a patch for GTK+, but for the time being, let's have a copy of the working implementation in GIMP code too.
With this patch, both failing tests are now working.