1 files changed, 7 insertions, 0 deletions
diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index 839e465..a7cc5af 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -3716,6 +3716,13 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
                                                                          Qt::MouseFocusReason);
                 }
 
+                // ### Qt 5 These dynamic tool tips should be an OPT-IN feature. Some platforms
+                // like Mac OS X (probably others too), can optimize their views by not
+                // dispatching mouse move events. We have attributes to control hover,
+                // and mouse tracking, but as long as we are deciding to implement this
+                // feature without choice of opting-in or out, you ALWAYS have to have
+                // tracking enabled. Therefore, the other properties give a false sense of
+                // performance enhancement.
                 if (e->type() == QEvent::MouseMove && mouse->buttons() == 0) {
                     d->toolTipWidget = w;
                     d->toolTipPos = relpos;