xcb: Don't activate bypassed windows on mouse press

Windows with "Qt::BypassWindowManagerHint" flag can't be activated by
mouse. They can be activated only from code calling "activateWindow()"
or "requestActivate()" methods.

The patch applies also for "Qt::ToolTip" and "Qt::Popup" windows which
have implicit "Qt::BypassWindowManagerHint" flag.

The patch fixes some major issues:
- don't activate tooltips on mouse press - this causes that Qt "thinks"
that original windows loses its focus causing e.g. that text cursor
stops blinking,
- don't activate X11 tray icon - this causes that the active window
looses its focus by clicking tray icon.

The patch restores the Qt4 behavior.

Task-number: QTBUG-53993
Change-Id: I80b226f2f5ea0ebbfe8922c90d9da9f4132e8cce
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/plugins/platforms/xcb/qxcbwindow.cpp

@@ -2201,8 +2201,11 @@ void QXcbWindow::handleButtonPressEvent(int event_x, int event_y, int root_x, in
     const bool isWheel = detail >= 4 && detail <= 7;
     if (!isWheel && window() != QGuiApplication::focusWindow()) {
         QWindow *w = static_cast<QWindowPrivate *>(QObjectPrivate::get(window()))->eventReceiver();
-        if (!(w->flags() & Qt::WindowDoesNotAcceptFocus))
+        if (!(w->flags() & (Qt::WindowDoesNotAcceptFocus | Qt::BypassWindowManagerHint))
+                && w->type() != Qt::ToolTip
+                && w->type() != Qt::Popup) {
             w->requestActivate();
+        }
     }
 
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